after yum update, system no longer boots

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http://forums.fedoraforum.org – This AMD system has been working fine with Fedora 20 for months. It consists of two identical drives working as RAID 1. These drives only have 1 partition: the root. After yesterday's yum update, the system no longer boots. It waits for a long time at startup, and then dies with a dracut error, "dracut initqueue device uuid not found" (and it shows the UUID of the raid system), and drops me in dracut rescue prompt. However, when I boot from live F20 USB, it finds the raid system fine, and working -- I see both devices in /proc/mdstat, and I can mount the /dev/md127 just fine. (HowTos)