I'm running into some pretty nasty site-breaking issues with Internet Explorer 10 and Stack Overflow.
While reviewing edits, I opted to "Improve" an edit. After making my changes and clicking "Save Edit", I was first prompted that I had an edit in progress, and did I want to "Stay on the page" or "Leave the page". When I chose to leave the page, I given an error message by Stack Overflow that
user xxxxx has already edited this post, where
xxxxxwas the user who suggested the edit that I was improving. Then, opting to save the edit again, I'm presented with spam protection because I was too quick on the "edits".
While editing a post I found on my own, another user edited and saved the post before I finished. I was given the message that "an edit has been made to this post", much as I would expect to see if I were just looking at the post. When I clicked the message, the edit textarea was gone and the edited post was shown. After trying to reload or navigate away, I was presented with a dialog that an edit was in progress, and did I want to stay on the page or leave the page.