On another machine that experienced the issue, it does go away after that addition to yum.conf! The update progresses smoothly/completely.Can someone who is experiencing the problem please try adding deltarpm=0 to /etc/yum.conf and see if the problem then goes away?
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Interestingly, the problem is 'machine selective'; it's only shown up on two of the four machines I've updated recently. I wonder what the commonality may be; one is my HP DL380 room heater whose kernel I cannot update, and the other is a much newer box with an Nvidia card that was my grandson's game machine.