Make sure that the $WAGLOBAL_Test_Mode variable is set to false:
$WAGLOBAL_Test_Mode = false
and that the $WAGLOBAL_Paypal_Sandbox variable is set to "false":
$WAGLOBAL_Paypal_Sandbox = "true";
When you changed to testing live transactions, did you change the API credentials live ones? Double check that you are using live API Credentials and not the sandbox ones.