NumLock problem

Have run into a strange problem in my app involving the status of the NumLock. I find that in various places in the program, such as in clicking a command button that fills a simple variant array, or sometimes just showing a form, the NumLock status is changed to off and must be manually reset to on. The odd thing is that nowhere in the app is the Numlock addressed in code and I can't figure out what is causing the off condition. Any insight into this problem would certainly be appreciated. Thanks in advance.

Boris

Additional Info: The development environment is VB5. The problem is not limited to a single machine and occurs in both the development environment and in the compiled version of the app. Thanks.