Addthis functionality conflicting with Nice Menus on IE 8

I know that this has a non-OP install item (Nice Menus), but Irakli also created a 'quick and dirty' install tutorial for Nice Menus, so my question pertains I think. We have been able to crash IE 8 by going to a page with addthis on it and mousing over the top level menu. Once we removed addthis, we don't get this crash. Anyone else using this combo and noticed this behavior? Please advise.

Thanks!