Payment process hangs up just before going to gateway

Ok sorry put have one more, whmcs says its in your ballpark.

When I client goes to pay by paypal the final screen where it supposed to go to pay pay hangs up. got the spinning bar but dosnet go further.

Now when i played with it I can click the paypal icon under the spinning bar and it will then move forward. Or if Im in an invoice I have no problem.

Seems to happen with credit card as well. I have had two clients try to pay and it just hangs on the final screen. I can go in the back end and do a capture on the card no problem.