I’ve had this happen periodically and have not tried to replicate it. It may be caused by run buggy procedures, but I don’t know. It has happened in several files on two different machines.
I will get a file that I can’t close out of manually. The red X will click. The File menu will light up if I try keyboard close. I can close every window except the last one. If then open a new window, move back to the previous window, I can close that and the new one won’t close.
If I run a closewindow statement in a procedure, the last window WILL close.
As far as I can tell, I can do everything else in that file, change forms, edit, toggle between Graphic and Data modes, minimize/maximize. Just can’t close the window.