When clicking the checkout button from the main page, or from within the cart (whether customer is logged in or not), the user is returned to the shopping cart... When any "chekout" button is clicked (cart.php?mode=checkout) the browser url displays a few diff locations before returning to the cart. Also, the background color is set to default for a few seconds (white) which never happened before and doesn't happen when moving between any other pages.
I can't find any threads about this so I guess I'll assume that I accidentally broke something but I don't know where to go to start looking for the problem.
Here's the shopkey so anybody who want's to try it themselves can.
http://www.madragz.com/store/home.php?shopkey=tequilaboy180x