Smoothing not working.
Previously I've had no trouble getting the smoothing/collision control to work (not always got the results I wanted, but it was a t least operating). Today, on a couple of occassions when I set it off, the little progress bar at the bottom of the screen has started at 0% and stayed there. And last time when I set it off D/S just vanished off the screen as if I'd shut it down. So without warning the scene I'd spent ages setting up was gone forever. What gives?