i made a clone of asteroids in blender and shortly before i finished it, Blender shows a grey screen. When i start Gameengine its grey, and when i render its Blue. I don´t know what has happened. I tried to restart Blender, but it doesn´t work. Other files worked correctly. Its not the camera, i tried to check the blender game outside of it.
Please help me, i don´t want to waste the game because of a false setting.
You just disabled render in the outliner (left upper corner the camerabuttons).
If you enable them you can play the game, and the render works too.
(I hope i got your problem right or did you want to change the backround and disabled the objects render?)