Sorry, I was being super concise with my other post because the issue is fundamentally concise - Turning on motion blur doesn't seem to work on my end. It just doesn't show up.
It is enabled in the render settings, in the liveviewer and it is enabled in the camera tag. The shutter speed can be super crazy but still can't get it to show up. I tried it in different scenes as well as completely new ones. I also tried the universal camera instead of the thin lense one. DOF and similar effects work nicely.
At this point I'm thinking I'm either having a giant brain fart or something isn't working as it should.
Does it work on your end?
I am on the Studio Drivers 441.28