Thanks for checking for me.
The issue was originally flagged up by a colleague in another office, who was having the problem in IE8 but when I checked, it looked exactly the same as in Firefox... as you've just found.
However, today, I'm having the same display problems too.
I'll check from home and see what it looks like.
Can anyone else see it correctly (i.e. as it appears in Firefox), or do the drop-down menus get cut off in line with the top of the "breadcrumbs" div?