Hey Mike,
Yeah, I'm aware of this setting as I use it as well as the "Block buyers who have feedback score of ? or lower" and "Block Buyers who have received 2 Unpaid Item strikes in the last 30 days". While the last two preferences are set when a listing is posted through Auctiva, the "Block buyers who don't have a Paypal account." option gets reset to false for some reason. I just checked these preferences in eBay after receiving your email and all three are enabled. Therefore I thought there was something that Auctiva could do, either to activate this option when posting the listing or determine why it is being reset when a listing is posted from Auctiva. Thanks.
Ashley