Hi Winon,

I understand that showing the form in non-modal fashion hides the problem, but I really need to have the form show as modal (the user is not expected to change anything in the workbook whle within the form.)

Digging a little more into the problem, I've checked that, when tab processing is not working, textboxes do not receive any KeyDown/KeyUp event, even though they're happily accepting input --KeyDown works again when changing focus and getting back to the form, as originally explained. Does this ring a bell?

Also, I've corrected the formatting of my OP as suggested.

Thank you,