I've never used this module, but it's possible that your cart is configured in such a way that the module's dependence on callbacks is failing.
You could explore making the following change:
/includes/modules/payment/dps_pxpay.php
Code:
// support for fail proof result notification
$this->_dpsResultRedirect = ('true' == ENABLE_SSL ? HTTPS_SERVER : HTTP_SERVER) . DIR_WS_HTTPS_CATALOG . 'dps_pxpay_result_handler.php';
// without
#$this->_dpsResultRedirect = zen_href_link(FILENAME_CHECKOUT_PROCESS, '', 'SSL', false);
change to:
Code:
// support for fail proof result notification
$this->_dpsResultRedirect = ('true' == ENABLE_SSL ? HTTPS_SERVER : HTTP_SERVER) . DIR_WS_HTTPS_CATALOG . 'dps_pxpay_result_handler.php';
// without
$this->_dpsResultRedirect = zen_href_link(FILENAME_CHECKOUT_PROCESS, '', 'SSL', true);
Note the removal of # and the change to true
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