Definitely try another browser, though I wouldn't be surprised if it's an account error of some kind.
I was stuck in a similar loop once when everyone was forced to update their passwords after eBay's database got hacked earlier this year. I don't remember how it got fixed but I think I had a chat with the customer support people.
On another note, I always get an error page after logging into PayPal through the home page form which says something like "the page you're accessing is outdated and you will be taken to another page" but it never does anything and I have to click the PayPal logo to get home and go from there. It's been going on for weeks and I'm sure I'm not the only one experiencing this. Amazing how long they let these kind of problems run for.
