This actually has happened to me a couple times before now, so I figure now is a fine time to report. Running XP, on IE8. FF is on another machine so I don't always have the leisure to test it there. Anyway...
When composing an answer, if the popup for "X new answers have been posted" shows up, I'll click it to see if I should abandon my progress or not. The text of them looks funny (but I think that's probably by-design for rendering), but the real problem is that the toolbar is shoved into my post editor. Screenshot for reference.
Just found out this morning, it doesn't appear completely fixed. In fact, the buttons are further down than before, probably impacted by the fact that the buttons are now cutting into the edit field from the start (see second screenshot).
Second Screenshot Old Image