One user (only) gets a 404 error when trying to use the righthand sidebar menu.
Their favourites link takes them directly to the Forum page but if they try to navigate to any of the other pages they get "Host Gator 404 Page not found".
They are using Windows 7 and both IE and Fx (same problem with both.
If they use an alternative computer (XP Pro and Fx) then it works fine.
Any suggestions about what sort of thing could be causing this??