This seems to be "broken" again. I lost about 20 hrs of work because of this inconsistent and unexpected behavior. Normally I keep my omnigraffle file in a shared folder to allow others to get the updated diagram as changes are made. A real shame, I have been using you guys for so long and this was one of the major benefits. I'll have to find a way to make dropbox work for me instead. Let me know if you guys decide to make a fix.