David,

I've not been up to top form lately, Sorry for the late reply.

>lcProduct must be non character at that point. Open the debug windows and put a suspend right before that line (or set a breakpoint). You might try setting the RowSourceType before setting the RowSource.
lcProduct is character. Have determined that already by messageboxes prior to the setting of RowSource :-
MESSAGEBOX(TYPE('lcProduct'))

Can we open debug window from EXE version?

However, I've discovered something interesting lately. Briefly, the same program's EXE ran OK on another machine (having same Win95B, same VFP 5.0, same Visual Studio SP3 patch), but this machine gave not OLE Servers not registered for the sliders in the calling form. I will update you on this more, later.

>FWIW by cComboBox class adds an array to the cbo and a SQL method which selects into the array and does a Requery()
What's FWIW?
Got this one. Also, tried changing RowSource programmatically/interactive. It's OK. The bug is not so straightforward.

Thanks.