Plug n Pay payment module

[swkhost]

Hi guys,
When using the plug n pay module (straight from their site) the cart is passing a session id twice which after passing through the payment gate way ends up with the id followed by a series of back slashes and repeats the session id in the url, which blows out the session the cart and does not record the sale. Any one come across this issue and whats the fix. I have confirmed that it is not on the gateway side as the double session id is being passed to it and any bugs in the mod have been corrected. This was org posted under oscommerce by mistake the cart being used is osmax thanks.