Its a weird problem, but I have ran my game on two different computers with Vista and the GeForce 6150 and the physics seem to be broke. Whne a body gets activated it falls through the tri mesh instead of colliding with it. Its been run on several XP computers with no problems, and a Vista machine with a GeForce 7900. Seems like the physics just aren't updated fast enough on those computers. But this is my world update line:
m_dynamicsWorld->stepSimulation(delta, 6);
Where delta is the time elapsed between frames.
Doubt anybody can help me but am wondering if anybody else has ran into this problem?