Categories: AutoCAD 2015

AutoCAD/AutoCAD LT 2014, 2015 and 2016 on Windows 11 – random crashes on startup/open

Affecting all versions of AutoCAD and AutoCAD LT 2014, 2015 and 2016

Random shutdown on startup or opening of DWG files. AutoCAD may restart after a few attempts. You see errors like:

Unhandled Exception 4 (Access violation reading 0x0014) at address 70DC63A9h

Additional error texts:

INTERNAL ERROR: Attempt to register class ‘AcViewNavigation’ twice
Error handler re-entered. Exiting now.

Issues are caused by the forced shutdown of AutoCAD components. You can fix the problem using the Longbow Converter App (you need version 12.61 or newer), steps to fix are as follows:

Before installing the Converter App, make sure the files downloaded from our site are not blocked by Windows SmartScreen… Windows 11 is finicky, click the TLC zip first to make sure it’s fully selected then Right+click the file and select Properties. Be sure to check the Unblock checkbox as shown below and Click OK…
Double click the zip file to open it and install the TLC application as normal. By the way, TLC stands for The Longbow Converter
Start the Longbow Converter tool
1. Select the 3nd tab named “Old AutoCAD Program Reviver“
2. Using the “…” button
  1. pick the path to your acad.exe file (or for AutoCAD LT it’s acadlt.exe)
    1. TIP: you can find the path by right-clicking the AutoCAD shortcut, clicking Properties and noting the ‘Target’ property e.g. C:\Program Files\Autodesk\AutoCAD 2016
3. Click “Fix Old Program”
Now start AutoCAD. problem should now be solved. If not, please contact Longbow Support

Tags: acismobj20.dbxAutoCAD LT 2015FATAL ERROR: (0x7ffb71c40005) C:\Program Files\Autodesk\AutoCAD LT 2015\acismobj20.dbxFATAL ERROR: (0x7ffd344f0005) c:\program files\...\acismobj20.dbx" when launching AutoCAD LTFATAL ERROR: acismobj20.dbxWindows 11

8 months ago

simonbooth

I just joined the Longbow Software team as a Software Engineer, and I have gladly offered to post some informative blogs for you all to read. Check on the left there, for all my blog entries...