admin login problems

I searched the forum. Didn't find the answer. So here's my problem. I can login to my Dolphin admin panel, but as soon as I try to go to settings or builder or anything for that matter, it takes me back to the login window but it has this url: http://weunitecouples.com/admin/index.php?admin_categ=5 What does this mean and how do I fix it? It was working fine and I have not changed anything at all on my computer or the site config. It just stopped working. Please help! I've been down for 3 days. Thanks in advance for the help.