Has anyone seen this error when trying to edit a newly imported mns file to CUI?

It seems that I only see this error in the menu and toolbar items that reference my custom dll file with all the button icons in it.
Is this in 2006? That sort of crash is a common site in 2006...
It may also just be something in your MNL. If you're in 2006 and have access to 2007, you may want to try it in 2007 and see if you have the same problem. If it's just the same old 2006 CUI problem, it's not worth the brain damage - the problem is caused by Autodesk.