Thanks, I have joined the group http://groups.google.com/group/googl...t-mod-support/

There are some references to this problem but no working fix so far...

Seems to be more active so will keep the technical stuff there. The mod is working as long as I process the order all through GoogleCheckout and their screens. Would be nice to have the orders duplicated in Zen Cart so we can support our customers and track orders easier.