flickering Materials

[dande]

I'm doing an animation which includes a moving camera and moving objects. I am getting some crawling in some of my materials.

 

I reusing FG. Creating my FG maps first, 1 file per frame, "incrementally add FG points to Map files" and using the medium preset settings

 

When rendering. I'm setting Final Gather map to read and interpolate over 10 frames

 

I have done a number of animations before and never come across this problem.

 

Thanks