Sunday, June 21, 18:47:44, for the first time in many years as a user, bid blocked, lost item.
Same day, same seller, different item, 18:48:28, bid entered, but lost item because bid too low.
June 24-July 17, bids OK.
Sunday, July 19, bid blocked, lost item at 12:44:34.
Same day, same seller, different item, bid entered, won item at 12:56:15.
Don't know what all of this implies about the system, except that it's erratic and very, very annoying.