IRR map animation issues?

[CEJ1976]

Hi,

 

I have rendered a number of animations in the past by pre-calculating the IRR map before loading it from file to render out my final frames.

 

I am having problems currently and I can't figure out what's happening? If i pre-calculate the IRR map for about 50 frames and then render those frames I have no problems, however if I pre-calculate the IRR map for the full 300 frames and then try to render i get those blotchy results.

 

I think I am just missing something very simple here but can't figure it out. Does anyone have some suggestions?

 

Thanks.

 

I have uploaded 2 sample frames as discussed.[ATTACH=CONFIG]45575[/ATTACH][ATTACH=CONFIG]45576[/ATTACH]