This gives "unstable" a whole new dimension. If I toggle between the trackside cameras with the End key and switch them to free look with the U key, they start to move by themselves. Very very slowly at first, but with an accelerating rate. This creates a very weird alias flickering effect in fences, track decals etc. At first I thought I had gone crazy, but if I press the U key again to lock the camera, the flickering stops instantly. Not sure if this is in build 590 because I haven't really played the game that much, but I figured I'd mention it anyway.