Hi, we finally have our previous issues with the incorrect IP address and installing crypt_blowfish ironed out and we're able to successfully make test orders. (Thanks for the help, Conor!) Now we have two more problems.

When I have the transaction mode set to "test" and I use a test credit card with all the fields filled in correctly, the order goes through. However, if I leave any of the credit card fields blank, or if I have transaction mode set to live and I try to use the test credit card numbers, I get the following error on a blank white page:

"Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."

It seems like when I'm supposed to be getting an error screen saying "you are missing fields" or whatever the problem was, I'm getting this message instead. Is Protx trying to send an error message, and I'm missing something on my end? Could this be because we're in a staging directory on the server, or is there some other reason why the error messages aren't showing up properly?

Here's where we have the cart installed:
http://www.bigmamaslings.co.uk/STAGING/index.php

The second problem is that when I turn on the debugging, the screen says this at the bottom:

Encryption NOT USED!

However, crypt_blowfish is now installed (there are no errors showing in the admin any more) and we have a keyphrase set. Does my client also need to set this keyphrase in the Protx admin somewhere, or change any other setting to make the encryption work?