Hi There, I too have been having almost exactly the same issue with Project 2013. A collegue also had the same issues with Project 2010 intermittantly where we tried everything from reinstalling the program, to ultimately replacing the PC with no success. We now both have Project 2013 installed and experience similar "Save" or "Save As" issues.

We are both saving files onto a Network server, so that we both have access to the files as required. We have found if the file location is local, it does not stop the error from occuring.

With Project 2013, The File Size has no impact on the error. Have experienced it with Large & Small files. While working we can Save the file with no issue. If an error occurs when we close we find one or two issues occur.
1. Close the file and are requested if you woulkd like to Save changes. Click Yes and nothing occurs. The file does not close.
2. Attempt to Save or Close the file & the attached error box appears "Project Cannot access the file". Change the Save Location or file name and the error continues. Also find that when we Save As to a complete new location, some of the data can change with extra lines added or durations changed.

The only work around we have been able to come up with for now is to intermittantly back up the file through the day. If Project does decide to go South & Corrupt the file, have only lost a couple of hours work rather then the whole day as we did when the error first started.

Any thoughts or suggestions?

Attached Images

Project Save Error.png (19.3 KB, 20 views)