Blank succes page PayPal sandbox and live- VM 2.6.22 - J 2.5.28

[postkat]

Hi all,

I have been testing with PayPal Standard in Sandbox mode. ( Virtuemart 2.6.20 on  Joomla 2.5.28)

When I cancel the payment I return in de shopping cart but when the payment is complete I return to a blank page
Return url: .../index.php?option=com_virtuemart&view=pluginresponse&task=pluginresponsereceived&on=Q7CW018&pm=5&Itemid=709&lang=

The debug log shows no errors and there are no server errors but the return page is completely blank.

Does anyone know what is causing the blank page?!

[postkat]

Can someone please answer my question and or provide a solution?