Actually, it looks like it's an issue with a tag in the postbit not being closed somewhere. Let me see if I can find it.
--------------- Added Sunday, March 22, 2009 10:56am at 10:56 ---------------
OK, it seems I was right. Try this...
In your postbit template find...
Change this to...
The problem is that the original portion is not a valid comment tag. Firefox and a lot of other browsers will automatically correct for this, IE will not.