Transaction Data is only sent on bank transfer - No data sent on PayPal, etc

[fourgood]

Hey i am using Magento 1.7.1 and OneStepCheckout (http://www.cogzidel.com/one-step-checkout/)
First after i installed your TagManager Addon i was getting an error at checkout:

a:5:{i:0;s:54:"Die angeforderte Zahlungsmethode ist nicht verfügbar.";i:1;s:4495:"#0 /var/www/vhosts/web187.server18.campusspeicher.de/httpdocs/mage/app/code/core/Mage/Payment/Model/Info.php(88): Mage::throwException('Die angefordert...')

#1 /var/www/vhosts/web187.server18.campusspeicher.de/httpdocs/mage/app/code/community/CVM/GoogleTagManager/Block/Gtm.php(81): Mage_Payment_Model_Info->getMethodInstance()

#2 /var/www/vhosts/web187.server18.campusspeicher.de/httpdocs/mage/app/code/community/CVM/GoogleTagManager/Block/Gtm.php(44): CVM_GoogleTagManager_Block_Gtm->_getTransactionData()

#3 /var/www/vhosts/web187.server18.campusspeicher.de/httpdocs/mage/app/design/frontend/base/default/template/googletagmanager/gtm.phtml(15): CVM_GoogleTagManager_Block_Gtm->_getDataLayer()

Then i commented out line #76 in Info.php
//if (($sessionCustomer->isLoggedIn()) || (!$sessionCustomer->isLoggedIn() && Mage::app()->getRequest()->getActionName() != "success")) {

After this it worked like a charm when using bank transfer.

After a while i realized that, if the customer uses PayPal or CreditCard, NO data is being sent to my Analytics at all.

Do you have any hint why this is happening?