Inventor 2020 Event Watcher: "OnDocumentChange" event not working

[DRoam]

For some reason, the "OnDocumentChange" event watcher is not working. From what I can tell from debugging, it's because the "OnDocumentChange" event is not being heard at all by the Event Watcher, while other ApplicationEvents are.

Can someone check and see if they see the same issue in 2020?

Any idea how to fix this issue?

[DRoam]

Update:

Looks like I'm getting the following message in the Output window with each document change:

Exception thrown: 'System.ArgumentException' in mscorlib.dll
Exception thrown: 'System.ArgumentException' in mscorlib.dll

It shows up twice, so I assume it's being thrown once with the "before" event and once with the "after" event.

Did a search for this error and didn't find much. Hopefully it's a useful clue for someone smarter than me.....

[JelteDeJong]

did you see this post? could be the same problem.

https://forums.autodesk.com/t5/inventor-customization/ondocumentchange-event-not-firing/m-p/4485795/...