I was going to buy a tune a few weeks ago, didn't have the gift certificate with me, so I set it up to go in a Shopping Cart. Now I can't seem to access my Shopping Cart. When I click on the option, I get an error message: . This is happening on both computers, one running OS 10.3.5 and one running 10.4.5. The computer running 10.4.5 (the laptop) is running iTunes 6.0.3. There doesn't seem to be any other updates for iTunes. I've tried rebooting several times. Any ideas?