1.4 particle effect problems

I have been using multiple particle emitters in the array section of explosion data to create some material damage effects (see example datablock below)

These work fine in 1.3 with all the different emitters making particles.

I recently upgraded my code to 1.4 and this part has stopped working.

I have tried to use the explosion data in the starter.fps crossbow explosion datablock just to check I had not made a mess of the merge but no joy there so I think something broke between 1.3 and 1.4.

The standard particle emitter in the explosiondata works fine, just the emitter[0] etc dont work anymore. I have tried stepping through the code several times and cannot see anything obviously wrong.

Does anyone have any ideas??

datablock ExplosionData(glass_Explosion)
{

   soundProfile = glass_ExplosionSound;
  //particleEmitter = glass_ExplosionEmitterJet;
  particleDensity = 50;
  particleRadius = 0.4;
  faceViewer     = true;
  explosionScale = "1 1 1";

  lifetimeMS = 400;
  lifetimevariance = 15;

  emitter[0] = glass_ExplosionEmitterPuff;
  emitter[1] = glass_ExplosionEmitterJet;
  emitter[2] = glass_ExplosionEmitterLumps;


  shakeCamera = true;
  camShakeFreq = "10.0 11.0 10.0";
  camShakeAmp = "1.0 1.0 1.0";
  camShakeDuration = 0.5;
  camShakeRadius = 10.0;
};