List box not displaying data

I have a search form with 2 combos and 1 list box.  Combo 1's rowsource is
a 
value list.  Combo2's rowsource is a query based on combo1's selection. 
The 
list box rowsource is a query based on combo2's selection.  It has 7
columns 
with #1 column bound.  After updating combo2, the list box shows the
columns 
with no data.  If I paste the SQL into a query window, it returns the 
records.  Why are they not showing up in the list box?
-- 
Thanks for your help!
Walter