As I mentioned before, PositionEntity works OK, no matter how far out I go, before I add all my mesh objects (the DrawMap subroutine). It's only after I've added them to my 3D world, that the PositionEntity for the camera goes bonkers
That sounds exactly whats happening. This is what happens. You set up a collision for the camera, THEN move it. Updateworld remembers the order the things were done, so to speak. So, if you've set up the other meshes with collisions, the camera will collide with them, because you have set up the entity type, before moving. It sounds like the camera is getting caught on something.