>Trying to keep it as simple as possible, in the full version, the program does what it's supposed to do immediately after the user presses a key. In the run-time, you have to click on the grid first before it does its bit.


I'm willing to bet that your troubles are being caused by a bit of VFP behavior that often cuases trouble: the exe will not give itself focus after starting. Check out Thread #351538 for an explanation and some API code that should help.