I did a search for this topic and a few others have had similar problems, except in theirs mr would just stop rendering altogether after 1 frame...in my case it renders everything and takes the right amount of time but theres no content to the images after the first.
The problem is strange because it basically will render the first frame told (whether this be 1,2, etc) but none after. So if i batch render frames 1 and 2 it will do 1, if i do 2 and 3 it will do 2 but not 3.
using maya 8.5 (i installed the service pack but havent uninstalled/reinstalled maya..is this necessary to sort out some problems?)
frames 1-2 (shot is a lot more but this is for test purposes)
by frame 1
frame padding 3
res: HD 1080
using pass custom alpha in mr settings as i have sss shader.
no GI, FG or MB
2 render passes, 1 master 1 lumDepth