I am not sure if this is even the right place to post this, but I need help, fast!!

Having trouble getting orders to authenticate through Paypal.
Had similar problems like this but was always able to push them through paypal.

But now when a customer clicks on log in. All my graphics including my header are not loading.

Then when it takes them through paypal and back to my site, their new order isn't even registering in my system.

Although free orders have no trouble processing through..
Help!