David-

Shoot. I'm sorry. I started to reply, then got distracted. :) Anyway, you're correct that my example does not apply.

>Even though my explicit requery after the append fails to rebuild the list, subsquently clicking on the combolist apparently does cause it to be rebuilt automatically, because the new value (a blank) does appear and the combo listcount has increased by 1.

Since you say the new item IS there when you click on the combo, why do
say "Even though my explicit requery after the append fails to rebuild the list?"