I posted this about 8 hours ago, but I dont think it made it to the forum.
I have a composition 6000 by 6000 which has numerous photos on it with a look like they are tacked to a bulletin board. I have taken this composition and dropped it into another composition that is 1280 by 720. I've added a camera and a null object to control it. I am doing basic camera fly-ins and outs over the photos. For some reason I cant seem to get motion blur to work on this.
The motion blur inside the main (big) comp is enabled as are all the individual layers. It is also enabled in the final comp that I am rendering......there's no motion blur at all.
I've never had a problem with motion blur before...how did I mess up?
Perhaps your camera moves are not sufficiently large to induce motion blur.
I suggest a test in which you place a dummy text layer in the final comp and animate its position property - set values across time that you know should induce motion blur. If MB occurs then you should look at the layers involved as well as the camera moves - increasing Shutter Angle helps to increase the amount of MB.
BTW, if there is no movement in your initial comp (bug comp), then it's redundant to switch on its MB.
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