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This list represents the reported issues and improvements resolved in Autodesk Revit 2018 within build: 20181011_1500. The resolved issues are listed based upon discipline and feature. For more information about these improvements, see the What's New section of the Revit 2018 Online Help.

It includes the following:

2018.3.2 Security Fix

Security
- As part of Autodesk’s ongoing efforts to provide the best security possible to our customers, we proactively applied security updates to our cloud servers. The Revit 2018.3.2 Security Fix includes an update to the product which is needed to maintain access to the following feature after October 31st, for more details refer to Autodesk Knowledge Network:
- Fixed a security vulnerability in communicating with web services.

2018.3.1 Hot Fix

Corrects an issue with non-English languages where the P&ID Modeler functionality did not load correctly after appling Revit 2018.3 Update.

2018.3 Update

Resolved Issues
- Platform
  - Annotation
    - Improved stability when canceling in-canvas dimensions and tag controls.
    - Fixed an issue that caused underlined small font to display incorrectly.
  - Cloud Rendering
    - Fixed an issue with the image file size rendering on the cloud when using the highest setting.
  - Collaboration for Revit
    - Fixed an issue that could cause DWG file link paths to be corrupted when collaboration for Revit is initiated.
    - Improved stability when loading larger files or working across a slow network connection.
    - Improved messaging at the start of the initiate collaboration process.
    - Improved stability when reloading latest if the active viewport has been deleted by another user.
    - Improved stability when user signs out of Autodesk A360 and then attempts to sync with central.
  - Color Fill
    - Improved stability when working with color fills.
  - Dimensions
    - Improved stability when adjusting the temporary dimension witness line during the creation of doors.
    - Improved the warning displayed when dimensions are not copied because they did not find a reference.
  - Export
    - Fixed an issue in which exporting sheets with section views to DWG could result in blocks being incorrectly positioned in the DWG file.
    - Improved stability when cancelling a DWF Export.
  - File Open/Save/Upgrade
    - Fixed an issue that could cause files and folder to be displayed in an incorrect order after selecting the BIM 360 location in the Open dialog.
    - Improved stability when saving models immediately after upgrading a Revit 2017 project.
    - Improved stability when upgrading a Revit project.
  - In-Place Families
    - Improved stability when editing an in-place component and modifying a view placed on a sheet.
    - Improved stability when copying and pasting in-place families, which could lead to file corruption.
    - Improved stability when associating family parameters to global parameters for in-place families.
  - Materials
    - Improved stability when using the Material Browser to edit materials.
    - Fixed an issue to allows patterns to be set in the Materials dialog when the project included multiple solid fill patterns.
  - Offset
    - Improve accuracy of the offset command when the copy option is unchecked.
  - Phasing
    - Improved stability when placing or modifying a room in a model that contains invalid phase information.
  - Printing
    - Fixed an issue where polymeshes (such as topography and RPC content) lose color when printing in Consistent Color mode.
  - Schedules
    - Improved stability when working with schedule view.
    - Improve stability when exporting a schedule.
  - Shared Coordinates
    - Improved results when linking multiple instances of a Revit project with geolocation and shared poisitioning is disabled.
  - Shutdown
    - Improved stability when exiting a Revit session.
  - Startup/Save
    - Improved stability when launching Revit as a restricted Windows user.
  - User Interface
    - Fixed an issue that prevented minimized view windows from being activated and displayed correctly when using the Switch Windows command.
    - Fixed an issue where Revit could run of out windows resources when working with multiple projects.
  - Worksharing
    - Prevents use of the Sync with Central command until background model calculations are complete.
- Architecture
  - Stairs
    - Improved stability when upgrading Revit 2017 or earlier projects that contain multistory stairs.
  - Walls
    - Improved stability when opening views that include wall joins.
- MEP
  - Conduit
    - Improved stability when editing conduit elements.
  - Duct/Pipe
    - Improved stability when editing pipe elements that are members of a group.
    - Fixed an issue that could cause the calculated pressure drop of the network to change when stretching an analytical pipe connection whose pressure drop is set to zero.
    - Fixed an issue that could cause systems to be removed or assigned improperly when using analytical pipe connections to connect network components.
    - Improved analytical pipe connections by maintaining their connection to pipes when using the Change Type or Reapply Type commands.
  - Fabrication
    - Improved stability when deleting a fabrication part coupling.
    - Fixed an issue that caused the MEP fabrication part browser to display blank services after upgrading a project.
    - Improved stability when using the Change Size command while working with MEP fabrication pipework.
    - Fixed an issue to improve stability when loading services containing dummy buttons.
    - Improved CID pattern 64 to support shape changes on the branch connector for ductwork.
    - Fixed an issue that caused the product entry of fittings to display as blank in the Properties palette.
    - Fixed an issue with the change service feature that caused the available service list to be over filtered.
    - Improved the snap accuracy when picking end points on stacks while using the Multi-Point Routing tool.
    - Added the oversize reviewable warning to oversized pars when using the multi-point routing feature.
    - Improved the behavior of pipe taps to maintain the original size after placement.
    - Fixed an issue that could occur when changing the service group and size from round to rectangular in a plan or elevation view.
    - Improved the behavior of fabrication taps so they resize correctly when re-hosting to different size pipe.
    - Fixed an issue that resulted in unwanted propagation when moving sloped fittings that are not perfectly aligned.
  - Family Editor
    - Improved stability when modifying a nested family in Family Editor and running the Add Insulation command.
  - Flex Pipe
    - Improved stability when a project contains a flex pipe that has lost its associated geometry.
  - Lookup Table
    - Improved stability when importing lookup tables into Revit families.
  - P&ID Modeler
    - Improved performance when working with Revit projects that are not associated with a P&ID project.
    - Fixed an issue with the display of the P&ID Modeler browser between Revit sessions.
    - Fixed an issue with handling localized P&ID Modeler help page links.
  - Schedules
    - Improved stability when using highlight in model command from a conduit run schedule.
  - System Inspector
    - Fixed an issue where pipe accessories and fittings were adding static pressure to the return system piping instead of subtracting static pressure.
- Structure
  - Reinforcement
    - Fixed an issue where the reinforcement cover could be reset to the default value after upgrading Revit 2017 or earlier projects to Revit 2018.
  - Steel Connections
    - Fixed an issue that could lead to project corruption when adding or modifying structural connections in a multi-user project.
- API
  - Improved stability when printing sheets through the API.
Improvements
- Added connection to Next Gen BIM 360 for cloud worksharing, which allows flexible access permissions for cloud workshared models within the same project.
- Updated the Scope Box drop-down list in the Properties Panel to display the scope boxes in alpha-numeric order.
- Improved the pipe sizing feature by basing the size of a single pipe attached with taps or analytical pipe connections on the worst case.

2018.2 Update

Resolved Issues
- Platform
  - Annotation
    - Fixed an issue in which tags moved when a linked file was reloaded.
    - Fixed an issue causing image files to incorrectly mask label text.
    - Removed the Model Groups category from the Load Tags & Symbols dialog.
  - Assemblies
    - Fixed an issue so that labels containing assembly parameters are correctly updated when a change is made to the assembly.
  - AutoCam
    - Improved stability when clicking context menu items in the View Cube while the Steering Wheel is on.
  - Color Fill
    - Fixed an issue that could cause incorrect results when using a color fill scheme set to By range.
  - Content
    - Improved accuracy when opening projects that utilize families in plan view.
  - Copy/Monitor
    - Improved stability when interacting with the type selector and then completing Copy/Monitor.
  - Dynamo Player
    - Improved Revit performance after Dynamo Player is launched and closed.
    - Improved expand/collapse behavior of Watch nodes in Dynamo Player.
    - Improved behavior of Watch nodes in Dynamo Player by collapsing consecutive spaces from String inputs.
  - Edit
    - Improved stability when using the split tool.
  - File Open/Save/Upgrade
    - Improved stability when upgrading a project that includes a corrupt family.
    - Fixed an issue that could cause unresolved pointer reference errors when opening projects.
    - Improved stability when the pointer pUser of Sketch is null.
    - Improved family loading by remembering the location of the last family loaded into the project.
  - Linked Files
    - Improved stability when inserting a Revit link containing invalid or missing phase data.
  - Materials
    - Improved stability when exiting painting material in a 3D view.
    - Improved stability when when replacing a material texture in material dialog.
    - Improve stability after creating a new material and dragging it into the local library through material editor.
    - Improved stability when editing materials.
    - Improved stability when quickly double-clicking on the OK button on the Material Browser.
    - Improve stability when working with materials browser to edit material properties and generate thumbnail images.
    - Fix an issue to display the correct material appearance preview.
  - Parts
    - Added the ability to copy reinforcement in parts when mirroring the original element.
  - Print
    - Fixed an issue with the Print Setup dialog so that work planes print as expected when the option 'Hide ref/work planes' is cleared.
    - Fixed an issue in which the Print dialog became disabled when choosing the Print to PDF print driver with Windows 10 anniversary edition.
  - Schedules
    - Improved stability when upgrading the parameter ROOM_SPACE_TYPE_PARAM integer type to ElementId type.
  - Sign In/Sign Out
    - Improved stability when quickly signing out of A360 and closing Revit.
  - Sketching
    - Fixed a crash that occurred when editing multi-segment grids.
  - User Interface
    - Fixed an issue in which ribbon menus disappeared after performing a print preview.
  - Views
    - Improved stability when a view filter included analytic or space categories and the energy analysis tools are disabled in the user interface.
    - Improved stability when reloading an active view that was deleted by another user.
  - Worksharing
    - Fixes an issue in the Synchronize with Central operation that mistakenly reports the model is corrupted.
    - Improved stability in workshared files containing sun and shadow settings saved in view templates.
- Architecture
  - Floor
    - Improved stability when setting the thickness of a floor to 0 while in the floor preview dialog.
  - Stair
    - Improved stability when upgrading projects with multistory stairs from Revit 2017 and earlier to Revit 2018.
  - Wall
    - Improved stability when deleting wall elements.
    - Fixed an issue so that wall core edges can be referenced when using the Pick Lines sketch tool.
    - Improved stability when activating auto-dimension and selecting a split edge in the wall preview dialog.
- MEP
  - Conduit
    - Improved stability when editing conduit to connect conduit surface connector.
  - Content
    - Resolved a constraint issue in the Pile Cap family, which caused it to not update correctly after the diameter of Pile-Steel Pipe was changed.
  - Duct
    - Improved stability when connecting a rectangular duct branch to a main run in a section view.
  - Duct/Pipe
    - Fixed an issue that could cause instability when modifying the size of a set of pipe or duct elements.
    - Improved stability when editing size of pipe or duct elements in the Options bar.
  - Electrical
    - Improved stability when changing an electrical circuit frame value.
    - Improved stability when selecting electrical wires.
  - Fabrication
    - Fixed an issue that was preventing pattern 2966 from inserting as a 45 wye.
    - Added support for exporting assemblies through the Export to Fabrication addin.
    - Improved support for mechanical tees in MEP Fabrication autofill tools.
    - Improved the sticky move logic with Fabrication parts to reduce the amount of unwanted downstream propagation.
    - Fixed an issue that caused parts to fail to resize on optimized systems.
  - Linked Files
    - Improved performance when opening a file containing MEP fabrication hangers.
  - Lookup Table
    - Restored ability to use the number type parameter to define a lookup size table column.
  - Mechanical
    - Improved stability when associating a P&ID project with a Revit project.
  - P&ID Modeler
    - Improved stability when exiting Revit after utilizing P&ID Modeler functionality during session.
    - Improved ability to map pumps in a P&ID project.
- Structure
  - Rebar
    - Fixed an issue where the value of the rebar partition parameter was deleted when upgrading from Revit 2017 and earlier projects to Revit 2018.
- API
  - Enabled the FabricationPart.GeometryChecksum property to simplify the checking of fabrication part geometry.
  - Fixed an issue so that the crop box is correctly set using the API.
  - Improved stability when placing a wall-hosted family on a ceiling through Dynamo.
Improvements
- Added support for changing service and/or size on MEP Fabrication parts.
- Improved the offset tag to use the string defined in the centerline duct settings.
- Improved filter color consistency with fabrication parts.
- Improved PCF output to report out the material specification.
- Added support for user defined notes in the PCF output.
- Added support for elbow angles in the PCF output.
- Added support for Instrument angle parts in the PCF output file
- Improved the usability of the Section Box shape control to more reliably detect cursor adjustment.
- Added the API RevitLinkType.GetLinkedFileStatus() to determine whether a Revit link is loaded, unloaded, or missing
- Added arrows in canvas to indicate which duct or pipe connector is highlighted in the Select Connector dialog while placing analytical pipe connections or using the Connect Into command.
- Improved P&ID modeler performance when associating a rvt project with a P&ID project.
- Improved task dialog to let users edit P&ID settings if no mapping relationship between P&ID class and Revit family is found.

2018.1.1 Hot Fix

Platform
- File Open/Save/Upgrade
  - Fixed an issue that could cause unresolved pointer references errors when opening files.
- Materials
  - Fixed an issue that could cause instability in Revit when creating a new category in an external material library.
  - Improved stability when clicking twice quickly on the OK button in the Material Browser.
  - Fixed an issue that could cause instability when editing materials.
- Sign In/Sign Out
  - Improved stability when signing out of an Autodesk account, then exiting and restarting Revit.
- Startup/Save
  - Implemented better error handling to improve stability related to the Revit UI state.
- User Interface
  - Fixed an issue that could cause menus to disappear from the ribbon after performing a print preview.
- Worksharing
  - Improved stability in workshared files that contain sun and shadow settings saved in view templates.
Architecture
- Stair
  - Fixed an issue that could cause instability while upgrading projects that include Multistory Stairs.
MEP
- Duct
  - Fixed an issue that could cause instability in Revit when modifying the size of a set of pipe or duct elements.
Structure
- Rebar
  - Fixed an issue where the value of the rebar partition parameter was deleted when upgrading projects from Revit 2017 and earlier to Revit 2018.
API
- Fixed an issue so that the extents of a crop box are correctly set using the API.

2018.1 Update

Resolved Issues
- Platform
  - Annotation
    - Improved stability when placing spot elevations.
    - Fixed an issue so that special text characters in the Latvian Windows locale display correctly.
    - Fixed an issue so that the Find/Replace tool and the Check Spelling tool display in the ribbon when multiple text notes are selected.
  - Color Fill
    - Fixed an issue that could affect the display of pipes that are connected by taps when using a system color fill scheme.
    - Fixed an issue that could cause instability in Revit when editing a color scheme.
    - Fixed an issue that could cause color scheme data to change unexpectedly when editing.
  - Content
    - Fixes the visibility and translation of the Family Name Key parameter within Steel Shapes family libraries.
  - Copy/Cut/Paste
    - Improved the stability of copy-paste when used with bind link workflows.
  - Families
    - Improved the stability of project files when copy-pasting families across documents.
    - Improved stability when selecting levels with families which contain a stale ID.
    - Fixed an issue in which some families have no check box in the Purge Unused dialog.
  - Graphics
    - Fixed an issue that could cause gradient background to disappear in views cropped with a non-rectangular crop region when placed on a sheet, while depth cueing is enabled for that view.
    - Improved stability with rendering with realistic.
    - Improved stability when rendering images with low-memory video cards.
  - IFC
    - Fixed an issue in which DirectShapes of the Structural Framing category were not checked by the Interference Check tool.
  - Import/Export DWF
    - Fixed an issue on DWFx export from very wide Revit sheet views so the resulting DWFx file opens successfully.
    - Fixed an issue when exporting multiple views to individual DWF files resulted in failed creation of certain views.
  - Keynote
    - Improved stability when creating a keynote legend in a model containing document corruption.
    - Improved consistency for keynotes when the numbering method is set to By Sheet and elements exist above the view cut plane.
    - Regenerates keynote legends at the time of print or export operations to improve the accuracy of keynotes near the crop region boundary.
  - Materials
    - Improved stability when editing materials.
    - Fixed an issue on the Materials dialog with tab labels that were not translated to the localized language version.
  - Linked Files
    - Improved stability when a local workshared model is linked and then reloaded from Revit Server.
    - Fixed an issue causing inaccurate length parameter for parts created for walls that are in a rotated linked model.
  - Print
    - Fixed a printing issue causing the last line of text to be cut off in some situations.
  - Schedules
    - Improved stability when editing a schedule.
    - Fixed an issue that could cause Revit to become unresponsive when trying to close a view using the close system button from a schedule view.
  - Site
    - Improved stability when editing a toposurface and adding new points.
  - Startup/Save
    - Fixed an issue that could cause instability in Revit when there is an interaction during startup.
    - Fixed an issue that could stop Revit from saving a recovery file in the event of an error.
  - User Interface
    - Fixed an issue so that reference planes correctly hide and reveal based on By Category Visibility/Graphics settings.
  - View Templates
    - Fixed an issue so that view templates remain assigned to views after syncing with the central model.
    - Fixed an issue causing background images to not update with view templates.
- Architecture
  - Area
    - Fixed an issue where modifying room elements would unnecessarily check out the 'Area and Volume Computations' workset.
  - Stair
    - Fixed an issue in which removing a group of stairs in Multistory Stairs failed to recreate them again by connecting the levels.
    - Improved stability when disconnecting a precast/cast-in-place multi-story stair.
  - Wall
    - Improved stability when modifying the dimensions of a wall.
- MEP
  - Analytical Duct/Pipe Connections
    - Fixed an issue that could cause a crash when analytically connecting two pipes to the same mechanical equipment connector.
  - Duct
    - Improved stability when selecting the drag control of a duct connector.
  - Duct/Pipe Pressure Loss Calculations
    - Improved stability when selecting the drag control of a duct connector.
    - Fixed an issue that could cause equipment using the Pump classification to display an incorrect pressure loss value in the pressure loss report.
    - Fixed an issue in the pressure loss report that caused an incorrect total pressure loss to display for the critical path.
    - Improved the time of the first flow/pressure background calculation after opening the project file so it is about the same as consequential calculations.
  - Electrical Panel Schedule
    - Improved stability when creating a panel schedule with corrupted data.
    - Fixed an issue where the sheet view is inconsistent with the panel schedule view if "Display multiple rows for multi-phase circuits" is unchecked.
    - Fixed an issue where the even circuit number can't be shown in a panel schedule when a two-column panel schedule template is set to Loads by Phase.
  - Electrical Settings
    - Fixed an issue when attempting to add a temperature to the correction factor for wire sizes in the Electrical Settings dialog.
  - Fabrication
    - Improved stability when using Trim and Extend on straight electrical ladder Fabrication Parts.
    - Added accelerator key to the Fabrication Part and Multi-Point Routing ribbon buttons.
    - Added a tooltip to the MEP Fabrication Part buttons for blocked content.
    - Improved the accuracy of MEP Fabrication auto length straights.
    - MEP Fabrication parts user interface removed when set to hidden in the Revit options.
    - Improved take-off and cut-in support on pattern 2868.
    - Fixed an issue in which the Multi-Point Routing tool failed to start using the ribbon button after switching service.
    - Improved the export of MAJ files to retain project profiles.
    - Improved stability when cutting into MEP fabrication parts.
    - Improved the behavior of pattern 2966 so that it can be used as a tee in auto-fill scenarios.
    - Improved the behavior of blank end type connectors to block connections to other parts.
    - Added the ability to Multi-Point Route from a fabrication valve.
    - Improved the behavior of connected variable angle bends to maintain a valid connection through angle changes.
    - Improved in-canvas rotation for combo tees from disconnecting on sloped piping.
    - Improved insulation carry-over values when starting the Multi-Point Routing tool from a straight's connector.
    - Improved the propagation of MEP fabrication parts when changing a branch offset from a rolled tee in the Properties palette.
    - Added support for inheriting service conditions when starting Multi-Point Routing from an open connector.
    - Improved the fabrication workflow by disabling the Multi-Point Routing tool when all valid straights are excluded or absent from the current service.
    - Improved the display of the MEP Fabrication Part Browser when it is launched during a Route and Fill command.
  - Phasing
    - Fixed an issue that occurred when drawing electrical wires that resulted in the deletion of project phases and of phasing information for elements.
- Structure
  - Rebar
    - Fixed an issue when editing free-form rebar sketches.
    - Fixed a case where having rebar visible in perspective views would generate incorect results.
    - Fixed a crash that could appear when sketching a rebar in 3D after the workplace is changed.
    - Fixed a performance issue that could appear when placing spiral bars.
    - Improved the behavior of circle rebar.
    - Fixed an issue that could appear when editing a rebar family.
  - Structural Connections
    - Fixed a crash that could occur when two users edit the same steel connection in worksharing mode.
Improvements
- Simplified Graphics Hardware feedback in Options Dialog.
- Enhanced renaming of views in the Project Browser by allowing in-line renaming, removing the need for the dialog box.
- Added the option "Simplify display during view navigation" to the Graphics Option tab to draw hatches and other effects when "Allow navigation during redraw" is selected.
- Adds possibility to create, modify and apply Browser Organizations to the Schedules/Quantities node of Project Browser.
- Improved the PCF output to group together similar part types so material lists are cleaner.
- Added support for exporting MEP Fabrication parts to a .MAJ through the API to improve manufacturing workflows.
- Added the ability to host rebar in elements that are modeled using in-place bridge categories in the API.
- Integrated Materials API

2018.0.2 Hot Fix

Platform
- Annotation
  - Improved stability when using temporary UI controls in an active viewport on a sheet.
  - Fixed an issue causing superscript characters to display incorrectly in some Windows OS locales.
- Collaboration for Revit
  - Improved publish operation efficiency and stability by reducing nested link data sets size and removing globally unloaded link data.
- Error Handling
  - Fixed an issue in which an error dialog appeared behind other Revit dialogs and did not behave properly.
  - Improved stability during startup of Revit.
- IFC
  - Added the ability to link IFC files in cloud-based models used with Collaboration for Revit.
- Materials
  - Corrected behavior of the materials browser when opening for the first time then properties tabs were not expanded.
- User Interface
  - Corrected a grammatical error in the Coordinate System Is Already In Use dialog.
  - Fixed an issue causing File tab ribbon and AppStore icon to display incorrectly in non-English languages.
Architecture
- Stair
  - Improved stability when connecting levels to create Multistory Stair by Monolithic and Precast stair types.
  - Improved stability when disconnecting a precast/cast-in-place multi-story stair.
API
- Improved stability when using the API to print or export from modal dialogs.

2018.0.1 Hot Fix

Improved stability when using the pick line tool.
Improved data integrity of the local project files after download operation when using Collaboration for Revit.