Somewhere in modifying the wpp module, I've screwed up the admin settings. When I click on Payment in the Modules section of the Admin page, two things are wrong:
1) There is nothing for wpp listed.
2) The configuration boxes on the right have disappeared for all payment options, no matter which one I select.
I've been checking and rechecking code. Any ideas what I did wrong?
I should add: at the same time this happened, the checkout_payment.php page suddenly turns up blank.