4.27 Motion blur not working?

Hi All
Help needed with motion blur in 4.27.
I have spent 15 hours struggling with getting motion blur working in a cinematic movie render in 4.27.
I converted from 4.26 which showed motion blur in final render perfectly.
But 4.27 shows none at all using the same settings.
Any advice? Would include render comparisons if I knew how to.

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