Deadly double clicks

I have big difficulties playing this game, because I can't control the number of attacks I make. The problem is probably that, for reasons unknown, my clicks end up recogniced as double clicks. Is there some setting I'm missing to adjust the sensitivity or to prevent double clicks? The only mouse related configuration I see is to switch the attack button. Unfortunately neither left nor right works. It's strange since the mouse I'm using doesn't have any problems with other programs, but in Desktop Dungeons I experience frequent multiattacks. Needless to say, it makes the game extremely hard and erratic. 
