shineworld

I hereby want to thank all of you for the answers. I misunderstood the mechanism of creating and destroying objects in Delphi, especially when forms are destroyed. So far the code has worked but only because an unclosed thread changed the cards in play. Thank you AGAIN for your time!

@Remy Lebeau you are right, just had to do with my project which is not good structured and something happens in the phase of destroying objects (I guess because I'm waiting for some thread stops). I've to change where objects are created and how they are freed. Surely I've mistake some important thing 🙂 https://youtu.be/MNppXiVvDZI

You are right, I've checked again with an empty program in BDS2006 and worked as you had suggested. But if I debug my big program the behavior is different, so there something that has changed the rules in my code! I need to check it... Thank you for the suggestion about AddExitProc(DoOnExit); // Put this line before Application.Run I don't know it before...