the motion blur and in fact all the settings are the same on all my passes and im using the standard maya layer with shader over ride to do the ambocc. using maya 7.0 still btw. i could switch the project to 8 if that fixes it but the client is still on 7 so itd be a pain for everyone..
i should mention that the alignment is probably even acceptable for production as its worst during fast motions which are heavily blurred anyways so its not so noticeable in playback. but if you look at it frame by frame its definitely off.