Nostalrius Begins - Quality wow vanilla realm (1.12)

I downloaded and installed via the WoW Classic Client. When I launch the game, the screen will go black for a moment and then minimize itself. When I attempt to maximize the window again, the screen comes up black and I can hear audio playing for a few seconds before it minimizes itself again. So the game is running, it just wont display correctly. Anybody have this problem or know of a fix?