Hi perkinscenter,
Sorry to hear that you are hitting difficulties.
[Code 13] – The merchant login ID or password is invalid or the account is inactive.
This suggests to me that there is a problem with your payment mode configuration.
Unless you are finding that the problem is specific to ticket products (ie, the same thing doesn’t happen if a guest tries to checkout with a “normal”/non-ticketing product) I think this is something where you’d really need to turn to WooThemes or the vendor of the payment gateway for further assistance, I’m afraid.
Would that work for you?