The "acismobj20.dbx" fatal error in AutoCAD typically indicates a conflict with the Autodesk Shape Manager (ASM)
Have a different fatal error? Check our guides on acge20dbx and heidi9.dll failures. autocad fatal error acismobj20dbx best
Now re-register it:
Windows Graphics Preference: Go to Windows Graphics Settings, browse for acad.exe, and set it to High Performance. 2. Reset and Repair Fatal error when opening received files - Forums, Autodesk The "acismobj20
If the file replacement doesn't work, use the built-in repair tools provided by Autodesk Support browse for acad.exe
Sometimes the error triggers not when editing, but simply when hovering over a complex solid. The selection preview tries to load acismobj20dbx and fails.