I'm having a sproadic problem that I can't reproduce, but has happened twice and at the most inconvinent times. I will create a PPT file using PowerPoint 2007 SP1 on a Vista machine and save it to a network drive. I will later open that file on the same machine (perhaps the next day), make some edits, do a Save (Ctrl + S) and close the file. I will then open the file on a WindowsXP computer running PowerPoint 2007 SP1. The file appears to be the original version and I don't see the edits I made. Even if I go back to the original Vista machine the changes are not there either.
I'm not using offline files on either machine. The problem has occured both before and after I installed Symantec Endpoint Security on the Vista machine, so it seems to be independent of the client AV. The server is Windows 2003 SP2. Unfortunately I've not been able to replicate this at will. There have been no other reported instances of any similar behavior, which I imagine is because everyone else is running WindowsXP.