I have been trying to solve this problem for days now and I'm starting to get desperate..
I'm trying to render an animation with batch render but something goes wrong.
My main object is supposed to move around a lot which is why it has a "point on poly" constraint and there is also supposed to be a stream of particles emitting from within the object.
When this is rendered out the object moves around as it should but sometimes it makes violent jumps, particulary in the rotate X attribute. Now, I know this is most likely caused by the strange way the constrainted vertex tend to "rotate" (normaly not even seen). I solved this by counter the rotation, key framing offset rotation X when it was needed.
So now everything looks good when creating a playblast or simply playing the animation in the viewport.
However... since the rendered animation still had those jerky movments I started to suspect that "batch render" was the problem.
That it somehow produced a slightly different result than the viewport so I downloaded an automated viewport render script but it still did'nt work.. For some reason I missed it before but you can easily see that the normal render produce a different result than what the viewport is showing.
And btw.. I play the animation from the beginning so that the particles are emitted as the should and it's also easy to see that the object behind the particles is still in a different location/rotation than the viewport.
so PLZ! If anyone knows what's going on... please tell me