Paysystems module help needed

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I am getting a strange issue when using the paysystems module. Here is the  progression of events:

1. Get to the confirmation section of my site (in my case it redirects the user to the Paysystems gateway)

2. The user enters in their credit card data and gets approved and so forth

3. The gateway redirects them back to my site where it is supposed to finish the transaction (checkout_process.php?cc_status=pass probably) but instead of getting the whole "Thanks for shopping with us" page, they get the customer login screen again. The customer logs in and then they can shot right back to their STILL FULL shopping cart checkout page.

It sounds like a session error of some sort but has anyone here encountered this type of problem before? I've tried everyone I know how to do and I am running out of options. I am using Paysystems module version 1.2a on osC 2.2 MS1.

Your help is appreciated,

Ceres