Many versions ago, I reported a bug in the Point List Dialog Box. For a while, I believe it was fixed. But recently, I noticed it has returned.
Sometimes, when opened, the Point List Dialog Box opens taller than will fit on the screen. If one attempts to resize it by grabbing one of its edges, the dialog box will vanish and then, all future attempts at any type of input, mouse operation, etc. results in an error beep. One might think the only solution now is the Task Manager. However, the truth is, that the dialog box is still open but just not visible. The simple solution is to press the Exc key as this presses the Close Button on the dialog box. Now, if one reopens the dialog box, it appears normal sized and can be resized via the mouse.