We have a shared file hosted on the server that has disappeared on us twice.
This is the steps that happened today:
1. Both users have the file open.
2. First user makes changes.
3. Second user hits save to see changes, but changes are not seen.
4. Second user closes file and tries to re-open it but finds that the file is missing.
At this point luckily they stopped and got me and I was able to save the file by doing a "save as" to the desktop of the first user and then moving the file back to its original location. My question is what could be causing this short of someone deleting or moving the original file which all users say they did not do?