have been having similar problems with PPro saving and have discovered the following
1/ DONT TRUST IT !!! CTRL S ad nauseam :)save save save etc…….
2/i think it works better when your project is on the same drive as the app (ie C:) but have no firm evidence yet 🙂
3/ have yet to be convinced the damm thing is actually saving the project file and is not just creating new autosave files
4/ DONT TRUST IT !!! CTRL S ad nauseam :)save save save etc…….