geoclock 0 Newbie Poster

I have been writing Delphi 1 programs for almost 10 years, and periodically get the above run time message. I have eliminated it on my machines, but other people still get it. I have no idea where it comes from, or what I am doing wrong. Obvously, I do not manipulate the visible property directly anywhere, no do I override the onshow or onhide event handlers. Does anyone have some real experience with this??