Here’s a helpful troubleshooting piece on the AutoCAD exception error in vl.crx / arx commands — a common but frustrating issue when loading or running Visual LISP–related functions.
If you’re seeing the "Exception in vl.crx ARX command" unhandled exception when launching AutoCAD or opening a file, you aren't alone. This is often triggered by a specific Windows setting that conflicts with how AutoCAD loads its Visual LISP components. The Quick Fix: Disable Beta Unicode UTF-8
How to Diagnose the Exception
1. Check if vl.crx is loaded
In AutoCAD, type:
Load it via APPLOAD. If that works, your VL engine is fine – problem is in a specific routine.
The most common solution involves disabling a specific language setting in Windows that AutoCAD currently does not support.
- Go to Settings > Apps > Installed Apps.
- Locate Microsoft Visual C++ Redistributables (all years).
- Select Modify > Repair for each installed version.
- Reboot the workstation.
5. Advanced Developer Solutions (For LISP Programmers)
If you are the author of the LISP code triggering this error, consider these debugging techniques: