I suppose I'm doing something very stupid here, but I'm sort of stuck, so..

I've integrated Newton 2 (latest beta) in my simulation environment and all looks pretty good;
I have lots of objects of 3 basic types - moving ones, resting ones and resting/immovable ones (mass = 0).
Objects that have an initial force applied - i.e. set by me using SetForce() - start moving, others don't, collisions looking really funky & realistic. I'm just wondering why the resting bodies hit by the moving bodies do not move.
The mass for the moving objects is 2x the mass of the resting ones (tried lighter resting objects as well), alas - if a moving body hit's a resting one it seems like the resting one is bolted down to the ground, the moving one slightly bounces of the resting body and 'finds' it's way around it
(can post a movie to clarify if needed)
This is without any materials for now, though I'm about to introduce them..
Any ideas?
Cheers,
KC