Text area behavior in IE9

I've had reports of "the cursor seems to want a life of its own" from IE9 users.  Users can't backspace or go forward to edit posts. 

(Also had issue with IE8, cursor popping back up to the top during long posts, but I think I have that one resolved with a crappy, crappy fix.  Why do they insist on using IE?) 

Anyone else hearing issues re: IE8/9?  Is there a fix?