>Hi Chris,
>
>Maybe it's one of the reasons outlined in my article: http://www.foxpert.com/knowlbits_200609_3.htm

Interesting read, thank you. I wound up tearing down the form and rebuilding it, an it works properly now. I presume some of the requery() shuffling I did caused the error. The troublesome combobox was the only one whose data had two requeries, the second parameterized to return fewer records.