Everytime I load my bsp map that I made in lightwave I fall through the ground
. The reason was I made a mesh over the 0,3,0 as the starting point. That appears to be a very bad idea. In my experience so far I fall through the 2 triangles that make up the floor. So your not going to be suprised by the fact that setting the camera to 1,3,1 stops my camera from falling through the ground. The very odd thing is it refuses to accept any flat polygon as the floor if I start at 0,3,0.
so if you always fall through your bsp check that your not starting directly above the centre of a box or 4 sided polygon (converted into triangle polys)