AutoCAD Plant 3D 2026.1 Update
July 21, 2025
Fixed Issues
Problems Reported Through the Customer Error Reporting Utility
As a result of the detailed information that we received from customers who used the Customer Error Reporting Utility, we were able to identify and fix several defects including the following:
| Equipment |
| AutoCAD Plant 3D no longer crashes when adding a new leg shape to an equipment. |
General Update Content
The following defects have been fixed:
| Collaboration Workflow |
| An open circuit error no longer occurs when choosing an Autodesk Docs project after switching from all accounts and all projects options. |
| An error while copying content to a stream no longer displays when opening a specific project. |
| Ortho creation and Iso creation always download the latest version of 3D models to create drawings. |
| Project Management |
| Orphaned OPC data are now removed from Data Manager. |
| Exported Excel files from Data Manager now have protected cells, consistent with the AutoCAD Plant 3D 2023 release. |
| Piping |
| Property editing now works for all ports in property palettes. |
| Pipe support size no longer resets during spec update in 3D models when resizing connected pipe, substituting pipe support, or moving it to another pipe of different size. |
| Status property remains unchanged when resizing the pipe or substituting a pipe support. |
| Bolt sets position correctly when flange wafer-type valves are placed without gaskets. |
| Orthographics |
| Valve geometry is now fully visible in ortho views for specific projects. |
| Specific flanges correctly display in ortho drawings for certain 3D models. These flanges also correctly display in output drawings after using the EXPORTTOAUTOCAD command. |
| Isometrics |
| The precision of the weight property in the Iso BOM (Bill of Materials) table can be adjusted using the Isoconfig.xml file. |
| The Iso message box expands properly to accommodate the enclosed text in Iso annotations. |
| Iso creation now succeeds when adding a pipe support to pipelines with small tolerance. |
| The line numbers box is resized accordingly when resizing the Create Production Iso dialog box or the Create Quick Iso dialog box. |
| Removed line numbers no longer displays when choosing “Showing line numbers in current drawing only” option in both Create Production Iso and Create Quick Iso dialog boxes. |
| Improved performance when filtering line numbers in both Create Production Iso and Create Quick Iso dialog boxes. |
| Spec Editor |
| A duplicate spec no longer opens when accessing the same active spec. |
| After removing parts from the spec in the spec sheet or the Catalog Browser, the selection automatically moves to the next item. |
| Size parameters no longer display when selecting multiple block-based parts in a spec. |
| Property column width is now resizable in Spec and Catalog tabs. |
| Changes saved from property editor dialog box are updated in the main interface for both Spec and Catalog tabs. |
| Save changes dialog box no longer displays when saving changes in the Spec Property Editor dialog box. |
| The property editor dialog box now allows typing decimal values less than 1. |
| New custom properties display in main interface when saved in the property editor dialog box. |
| Warning dialog box no longer appears when saving the Iso Symbol SKEY property changes in the property editor dialog box. |
| The valve operator no longer displays when creating a new valve with the pipe component set to valve. |
| Valve operator long descriptions display correctly when editing properties in the Part Size tab. |
| Default valve operators display correctly in the Override Valve Operator dialog box. |
| Rounding functions correctly when switching from imperial to metric units. |
| Duplicated OLET no longer display in Iso Symbol Type drop-down list. |
| The ContentGeometryParamDefinition property no longer displays as changed for a spec when importing back excel spreadsheet without any changes. |
| Undefined size is no longer saved to the catalog when switching to another catalog. |
| Part preview and size parameters now display when selecting multiple sizes in Catalog Browser. |
| Filter and search results are maintained in Catalog Browser when changing any values in the main interface in Catalog tab. |
| The plus (+) and minus (-) shortcuts now move properties correctly in AutoPLANT to Plant 3D Mapping dialog box. |
| Specific specs correctly display in both Spec Editor and Spec Viewer. |
| Report Creator |
| Report creator migration works for specific legacy RCF files. |
| Interoperability |
| Decimal separator now honors the Windows settings when opening drawings in Navisworks. |
| Specific objects now display in the correct layers in Navisworks, when setting the PLANTIGNORENESTEDLAYER system variable to 1. |
