Your point about my lengthy combobox is well-taken. The reason I think I can get away with it this time is... this particular combobox will only be used in extremely rare cases so it won't be a big headache for the user. I discussed this with the user yesterday and they are OK with it. Also, my form is so cramped and crammed with data entry boxes that I don't have much room for anything but a combobox.

Thanks for running that test on 152 rows. That means my combobox should work so I must have a mistake somewhere. I appreciate it. Now to find and fix it...