Broken Checkout after installing Google Checkout

Hey,
I just installed Google checkout, and it seems to have destroyed my checkout procedure..... everytime I click the "continue checkout button", it now brings me to the advanced search page. I can get to the page where you choose shipping info just fine (main_page=checkout_shipping), and if I type in the html box i can get to main_page=checkout_payment, but the continue payment button is broken.
Luckily, we are still a bit away from going live, but any help would be appreciated,
CRL

Update -
any time I try to progress in the checkout process using a button, I am sent to the advanced search page.... that includes the continue button located in the change address page.
So what would alter the checkout order?

just for the sake of completeness.....
I fixed this, turns out the link to "advanced search" in my search header was the culprit. For some reason, when the form was submitted on that page, it was submitted to that link. I removed the link, and now we work fine.