>I have a non-modal form with a command button which opens a second form (the second is modal). From the EXE, my users are reporting that from time to time, the modal form is opened Behind the non-modal form, and they cannot bring the other on top. The only way to deal with it is to use the hotkey for the close button of the modal form.

Yes, this has been posted on before, as John mentioned. Just a thought: have you tried setting the Modal to Alwaysontop and the non-modal to Alwaysonbottom (temporarily), see if that helps?