Admin Panel Looping Page when Logging in

Hi, anyone out there who knows why whenever I log in to admin panel it just loops back to the same page and asks for the credentials again? For some reason it doesn’t occur when I use firefox. But other users are experiencing this issue no matter what browser they use.

We have 5 cs cart installations and only one of them has this issue. Hope someone out there who really is a very nice person who can help me :)

I’ve had this… I think (but am not sure) I fixed it by clearing the cache through FTP. (just delete var/compiled and var/cache)

Make backup first just to be sure ;)

Thanks for replying. We will give this a try.