I'm having the same problem. My buyers are having trouble paying with PayPal. They keep getting directed to the Auctiva site which then refuses the payment. I'm at my wit's end. I get emails from Mail Server returning my invoices for long, convoluted technical reasons that refer to Auctiva. I copied the message and pasted into an Auctiva support message which was refused. Not only can I not find out why my buyers are having so much trouble with Auctiva on PayPal payments, I can't even report the problem. Somebody, please help! This has been going on all week and we're all frustrated.