when i open the game from steam it jsut opens a white window which then flashes a few times and disapears, then shows the SK icon and java underneath it. wont let me cmd Q steam or SK.

java:

Last login: Thu May 1 18:47:04 on console
leons-mac-mini:~ LeonWood$ java -version
java version "1.7.0_55"
Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)
leons-mac-mini:~ LeonWood$