Using 7.1 and 800 x 600 screen yesterday I altered and recompiled a screen and it got thoroughly trashed with the title bar and menu disappearing. I reloaded from back up and I noticed that the top left of the screen was just outside the screen. I dragged the screen down & right and recompiled. Re-read and no problem. Moved the screen just a touch too far up & left, recompiled and re-read. Trashed.
Changed screen to 1024 x 768 and used more care!