“There is an autosave of this page that is more recent …”

The way the autosave feature works is by comparing the date/time the post was modified with the date/time the last autosave was modified. Autosaves are stored in their own row of the posts table. When you click the save button it changes the post_modified date/time of the post. If you then continue to work without saving, and autosave kick in, the autosave post_modified time will then be greater than the date/time of the last time you clicked save, which gives you the message the next time you click save.

I realize that may be a little confusing, but it’s the intented behavior. If you work on your post without clicking save, relying on the autosave feature to save your work, then you shouldn’t recieve this message.

I didn’t exactly mean that getting the message when, theoretically, you shouldn’t was the intended behavior, although that is pretty much what I said. What I meant was that the way they do the check was intended. Your options are to file a trac ticket, and get it improved, or edit the autosave interval to be longer thereby reducing the likelyhood of the confliction.