Black screen for a very long time after you click to play game. The game does eventually come up but it's not initially obvious that the game isn't just frozen or broken. I'm sure this will result in a fair amount of 0 star votes from people thinking the game wouldn't work.
The least you could do is throw a loading screen there instead of just all black.
Wonderful games as always, but this is a sour enough point it needs mentioning. Five star quality work aside from that.