Fyi, i had not had this problem for quite a while, but it just popped up again today. My work machine uses IE6 (can't use alternative browser, can't self-upgrade to IE7).

this is what it looked like after a new post.

this is what it looked like when trying to edit said post.

this is what it looked like after editing.

no big deal, honestly. just wanted you to be aware. no such issues at home (IE7, Opera, or Firefox).