Hi Jim,
I checked for the leading slash, but that is not the problem, because even when I scroll, it's still the top two rows that are not selectable.
Anyway, I ran tests with Coverage and am stymied. Here are my results, tell me what you think:
1. I clicked on the bottom row of the listbox which was selectable, as expected. Coverage showed these methods fired:
a. listbox.when
b. listbox.GotFocus
c. SetLastUserActivity (called by listbox.GotFocus)
d. listbox interactive change
e. listbox when again (!?)

2. I clicked on the top row of the listbox which refused to be selected. Coverage showed these methods fired:
a. listbox.when
b. listbox.GotFocus
c. SetLastUserActivity
--and that's all!!

The InteractiveChange method did not fire!

So the difference between the two scenarios is that the InteractiveChange did not execute when I clicked on the row of the listbox that refused to be selected, whereas it did execute when I clicked on the row of the listbox that was selected.. Do you have an idea of where I should search next??
Also, I wonder why the listbox.When fired twice in the first scenario.

Any ideas? Thanks, Chaim