I have had two intending buyers report to me that an item that they had put on their watchlist which had then sold to someone else (as a Buy Now) was showing as having "closed and did not sell". They were asking me to relist it, when of course I couldn't as I had only one of the item. See the included screenshot from my view of the page as the seller and theirs as an intending buyer. The closing time (2.05 pm March 5) clearly shows that it is the same item.

A somewhat frustrating situation which I don't expect to be solved here, but I felt I needed to air it anyway. On March 22, I sold a small lot of of stamps for $2 (with postage of $2). A few days later, there was a payment from the buyer of $2 in my bank account, so only the stamps, not the postage. My initial assumption was that he intended to bid on some more lots to take advantage of combined postage, but no other bids eventuated.  So in the following week, I sent a polite email explaining he needed to pay another $2. No reply, no payment. So at the weekend, I sent another message, and a...