I’m making RPG game like Dungeon Siedge (point n click style), based on Brazilian folklore(I will post the screenshots soon 
). I have made a techdemo for testing the game engine (lights, uv map, water, etc)and a point n click, but I have some problems :
I have a scene with a ortho camera and a cursor with a ray sensor to return the point that I click, and another scene with a ortho camera pointed to a ground(a plane) with a add overlay scene actuator.
When I play, a ray sensor cant found the ground to return the position!
Someone knows a solution?