I've not had any such problem. A few possible remedies:
- You are scrolling down so that the box is fully on the screen, and not half on the screen and half below it? I know that's really obvious, just covering it in case.
- Is this with new posts, or just replies? If just with replies, does it still happen if you switch to full reply screen instead of quick reply?
- If all else fails, now is as good a time as any to plug Firefox. It's a superior browser in every way and fully customizable (can even theme it to look just like IE if you really want to and you're used to the look), I have no issues with LttD or any other site with it.
"The devil I'll bring you," answered Hagen. "I have enough to carry with my shield and breastplate; my helm is bright, the sword is in my hand, therefore I bring you naught."