My debris won't rotate

I can't seem to get my debris to rotate while falling/bouncing etc.
Everything else seems to work fine.

any suggestion would be welcome

thanks.

datablock DebrisData(BrokenGlassDebris)
{
   shapeFile = "~/data/shapes/windows/glassshard.dts";
   elasticity = 0.3;
   friction = 0.5;
   numBounces = 3;
   bounceVariance = 2;
   explodeOnMaxBounce = false;
   staticOnMaxBounce = false;
   snapOnMaxBounce = false;
   minSpinSpeed = -90;
   maxSpinSpeed = 90;
   render2D = false;
   lifetime = 2;
   lifetimeVariance = 0;
   velocity = 4;
   velocityVariance = 2;
   fade = true;
   useRadiusMass = true;
   baseRadius = 1;
   gravModifier = 1;
   terminalVelocity = 0;
   ignoreWater = true;
};