Okay...I'm officially at my wit's end. What, other than missing files, could possibly trigger this error?
PayPal WPP installation incomplete! There should be XML files located in /dorrmill/catalog/includes/wpp_xml/ !
(doDirectPayment.xml)
I'm staring right at 'em. doDirectPayment.xml is where it should be. I've got permissions wide open at the moment. (The weird thing is that this all was working some weeks ago. I have no clue why it's unhappy now. And I've pretty stripped down to the straight files of this mod for the checkout process.)
Any guesses of where to look would be greatly appreciated.