Thank you for your reply - but we finally figured it out.
We were told that Set Bitmap=off will improve performance in a Terminal Server configuration. We have not found that to be the case.
However, a checkbox can flicker in a grid.
Interesting.

>>Problem: A checkbox in a grid flickers when it is the current object on one customer's system. Of course, I cannot duplicate it.
>>What has been tried: Microsoft video drivers, nothing in background (virus, screen savers, etc), different video cards, Win2000 and WinNTWkstn, standard mouse drivers.
>>The checkbox in the column for the grid has both sparse and bound false.
>>Again, I cannot duplicate and this has not been reported by over a thousand customers.
>>So, where else should we look?
>>Any help would allow me to get back to programming new stuff.(A litle coding humor..)
>>GorgAnna