>Recently, I started a thread as to know what makes the ESC closes the form. I've been searching my framework and there is nothing in there that has been done to do that. We don't have any button on the form, no ON ESCAPE and nothing in the KeyPress() event. What I think is that the recent version of VFP could make that a default when that key is pressed to close the form. Could that be it? If yes, does that make sense that it is not applicable to modal form?

Have you check this behaviour on a clean base class? It may make it easier to track what is causing it.