Quote Originally Posted by breck View Post
but don't see the point since it was tried by others already with no success.
Each case is unique.
Your situation is apparently related to the checkout_payment page.

Most of the others I've seen are related to the checkout_process or checkout_success page ... and that's a result of an email problem, for which a fix has been published.

Since yours is failing on the payment screen, it's important to know which payment modules you have enabled. But, you keep talking about shipping modules instead ...