On my test system, google checkout works correctly but the button appears on evry page and it appears to slow the system down drastically. I've turned it off because there is a "serious" problem with comments on orders that I never knew and am trying to fix.

You know when you put stuff into the comments on orders, and don't notify the customer ? I assumed that this was for internal notes, so with one very dubious person with odd delivery adddresses and multiple order cancellations, I put "possible fraud" on the order comments so I could remember. Turns out all comments whether they are notified to the client or not, are readable on the order page, so I am adding a "discreet" module, since I've been feeding merchant warnings from the payment gateways into the order comments, to protect te shop owner.