Hasta La Motion!

I’m just trying to render out a sequence of a matchmove and a couple of 3d objects in maya.
I essentially just wanted a quick jpg sequence to view back as a preview.

Very very simple scene, just a sphere sitting on a box and the box has the mip_matteshadow applied to it.
Utilising the typical workflow (rayswitch enviroment/mirrorball/cameramap) that is outlined in the ‘production’ pdf on the mental images website.

I’ve changed the default Mentalray Texture Node with the maya File Node and loaded the ‘back plate’ image sequence with the Use Image Sequence cheked.
In the Render Current Frame it all looks good and I can scrub through the timeline and everything lines up but when I Batch Render only the first frame is correct. As the box with the mip_matteshadow appears to be using the first frame (basically just looks weird!).

Any thoughts or ideas how to work around this for now ?