Does the new 1.38a work with Paypal Payment Pro sandbox?

Here's my situation.

I am running 1.38a with express/payment pro module installed. All API credentials are loaded. I can checkout with express no problem. But when I go to checkout with CC on site, it eventually gives me a time out error. So my question is, is the sandbox working for testing purposes. If so, where did it go wrong?

I have not tested this on LIVE mode yet.

Thanks and happy holidays.