Amazon installed just fine on my site but when I go to checkout I get the error: "We're sorry, but we're currently having problems retrieving order details from the merchant, and cannot process your order. Please return to the merchant's website and try placing your order again. "

I noticed someone had this issue earlier and corrected it with a change in the php.ini, but mine is already set to allow_call_time_pass_reference = true.

Any ideas?