There is a bug in TinyMCE which makes it unusable for IE. I attached a patch since I have not the rights to commit to the TinyMCE code... I also [url=http://sourceforge.net/tracker/index.php?func=detail&atid=635684&aid=1769487&group_id=103281]filed the issue at their Sourceforge tracker[/url]
The confirmation dialog ("Are you sure you want to navigate away from this page...") appears also if no changes where made.
> There was somewhere a discussion about that but I can't find it.. have you an idea where the bug resides Elijah? Otherwise I'll open a ticket for it.
I think this is the bug you are looking for: [url=http://open.silverstripe.com/ticket/1372] Ticket #1372 - Change Detection Broken in TinyMCE 18.104.22.168 cause Confirm dialogue every time page is edited[/url] :)