that is the problem. I was able to resolve this issue by changing line 75 of uc_multipage_checkout_payment.module, by changing the following line from:
'#value' => '<div>' . $payment_details . '</div>',
'#value' => '<div id="payment_details">' . $payment_details . '</div>',
and adding an id for the payment details pane. I can submit a patch, but not sure where to post it. Thank you for contributing this module.