the mouse curser is not alined with where you "click" in the game menu buttons, the "hotbox" is lower then where you have to click, so it becomes more or less implausible to press either multiplayer or single player and such, and it is implausible to press cancel when selecting a new single player world.

(the pictures below show in what menu i am talking about, please note that the curser is more then one "button" below where you are supposed to click, so when you click on multiplayer, is chooses single player)