When using any other mods that touch the same core files you will need to merge in the appropriate code. Sounds as /admin/orders.php is the common file here.
Wish I could help but I don't use Edit Orders.
And I doubt you will find too many folks right now running Edit Orders at the same time as Google Checkout mod, since GC is still beta. Just testing with standard Zen Cart install is the immediate focus.
Woody
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