Issues with Viewport 2.0

I seem to be having a strange issue with the viewport when I'm trying to create and manipulate nParticles.

When I'm using viewport 2.0 the liquid systems work fine, but the particle systems bug out in a  very extreme manner.

Even though they are supposed to be emitted from the head of the torch, you can see the shape of the flame under and infant of the model. It seems to lock it to only moving in the Z and Y axis, making it perfectly flat along the X axis and displacing it.

All of the images below are screenshots of the viewport as i play through the animation, even though they look a bit closer to some bad pop art.

I can work around this issue using the other view ports but it is concerning to say the least.

I have tried to replicate this with other files and it seems intermittent. It happens far more often when I'm using age or normalised age values to affect my particles in some way, either through opacity colour or incandescence.