Closing, my response is the same as the linked thread, I need reliable steps to reproduce. I suspect whatever cloud system you are using is somehow conflicting with C2's save process. In case it crashes during saving, to avoid corrupting your project it first saves to file.capx.tmp. Then, only if the complete save process was successful, right at the end it deletes file.capx and renames file.capx.tmp to file.capx immediately afterwards. I guess the cloud sync software manages to work its way in to the gap and block C2 from renaming the file. I'm not sure what we could do about this without risking corrupting projects if it crashes during saving!