This discription isnt that great
Just for lawls i tried to figure out wtf you were talking about, and here is what i concluded.
1. The "Exit Game" button only shows up at the main menu, after clicking on Exit Diablo III. Its not at all possible to accidently click this button instead of leave game. You "might" accidentally click the Exit Diablo III button, which would kill the entire Diablo Proccess (if pressed while ingame instead of the Leave Game button).
2. The error that you are having involved your sleep loading time.
3. This problem is suppose to auto correct itself. The problem with this script and it auto correcting itself is i believe this script has the wrong PNG for Exit Game. The PNG should be of "Exit Game" and not "Exit Diablo" since the "Exit Diablo" button is covered up by Exit Game at the time it would search for the error.
Solution. Change the PNG file. Use an image of "Exit Game" from one of the other dozen scripts.