I don't see that window title or error message anywhere in our code. This error may be getting caught by the operating system which is showing a generic error dialog. If you can reproduce the problem, please pass it along to your VAR so they can get a problem report written and an SPR generated.
I uninstalled what I suspected to be the problem - Toolworks BOMmanager. I uninstalled that and the problem disappeared. However, the Maxwell render plugin stopped working. Reinstalling that (repairing actually) fixed the problem. Thought you may want to know, since I didn't contact my VAR.