Forum Problems with browsers
 

I just upgraded to 4.01 from 3.8.4 and now when some of my members log in to only some forums they have a very large white space between the header and the first post in the forum. I have windows 7 and have no problems but my wife has Vista and she gets this only on 3 forums that are set to private, although she is a memeber of those forums. I have also had this complaint fro others. Is there anyway to fix this?