I got the digital download of Diablo III for Mac and everything seemed to have downloaded fine. My launcher comes up and says "game is up to date" next to the "play" button, but when I press play, my computer just goes to a black screen where my mouse is still visible but nothing else.

At first I thought it was just loading but I let it sit for fifteen minutes and got nothing. Also I can't minimize it so every time I try to launch the game I have to manually restart my computer. Pretty frustrating.

Any suggestions?
I'm trying to avoid a full reinstall if it isn't necessary.