I did check that, and it's not set but the behaviour I'm seeing is pretty much exactly what's being complained about above - AutoExpand can work OK but only for the first 100 or so entries in the list and then it stops, though it works fine if you've dropped down the combo list. Some people have suggested that the problem's more prevalent on subforms rather than main forms, and I had that impression too, but I can't say I've exhaustively checked it. I thought there were some combos which weren't AutoExpanding at all, but I've realised that once I'd spotted the problem, I was just routinely typing in the initial characters 'a', 'b', 'c' and so on to see how far each combo got without thinking that some lists begin with entries that start with non-alphabetic characters.