>Do you think it matters if you populate via a query in RowSource or not?
Yes I do. Try to run query into array and use it as RowSource

In one of the listboxes that DOESN'T scroll, I have RowSource set to c:\path\prog.prg
and RowSourceType set to 4 (query). Yet, it doesn't work.

In another one that DOES work, I have RowSource set to blank and RowSourceType set to 0 (none). In this one, I have code in the INIT.

All these listboxes reside on a page within a pageframe. Do you think that plays into it at all?
Rich