I've had two customers (one on Saturday and one today) who have been unable to buy multiples in my "buy it now" listings; ebay also made them pay for each one individually and instantly. I went back to the listings and the "require instant payments by Paypal" box isn't checked. Makes it hard to invoice and give a shipping discount; I've had to get them to buy whatever they want and then refund the postage overcharge. The buyer on Saturday said he contacted ebay and they told him there was a system-wide glitch they were working on fixing. Anyone else heard anything?