[ODE] triangle collider surface

[Nate W]

I think I'm down to the last problem now.  Boxes bounce off the terrain as
expected, but spheres seem to behave as if the surface was inverted.  
They get sucked through the ground rather than bouncing off of it. If I
'throw' a sphere back up from below ground, it bounces back down.  If I
throw a box up from below, it behaves like it should (passes through, then
lands on the terrain on the way back down).

Any idea what could be causing this, or how to fix it?

Thanks.
 
-- 

Nate Waddoups
Redmond WA USA
http://www.natew.com