I've had this document open since 8:00 AM when I came in to work. I occasionally make changes and save the document. Just now I tried to do the same but I get the following message:
I'm getting very tired of this. It happens a few times a week. Today it's happened twice on the same document in 3 hours. When it happens I have to save it as a copy, delete the original and rename the copy.
I'm 99% positive nobody else is using the document (it's on my personal site, not the main company site)