Can't save a VCP project

All of a sudden, if I edit a Menu I can no longer save the project, it just hangs. I can save as Xojo Binary, but not as Xojo Project. Any tips from Xojo about what to look for?

For anyone with the same problem, perhaps this will be helpful. In the project folder I saw that the file Menu.rbmnu was 4.3 MB. I opened it in TextWrangler and found one of the menu shortcuts was set to an enormous number of backslashes (it should have been a single backslash). I removed them and saved (the resulting file was 57 KB). I opened the project in Xojo, edited a menu, and saved, this time without problem. Everything seems to be back in working order.