I have a Windows 7 Ultimate machine at home. When I log in to the empeg forum, it initially says "Welcome Shonky" in the top right and the unread posts are displayed.

As soon as I open a post, it goes back to "Not logged in" or words to that effect. Posts that are read are not marked as read. Also it's effectively impossible to post since I can't really log in. As soon as I go to a secondary page I'm logged out or IE8 forgets I'm logged in.

I have IE8 on two WinXP machines and there's no problem with them. So I'd guess some thing with cookies and the Win7 / IE8 combination.

Other cookies seem to work just fine. e.g. facebook and other forums (although I don't frequent any running UBBthreads I don't think)

Any ideas?