Thanks for looking. For me it only affected one of a dozen dashboards. Unfortunately, my primary and large one. Another thread led me to checking for zero devices for the dashboard. I was able to go to the dashboard setup page and see that the number of devices was "0". Adding the devices back to the list restored everything, no other setup required. What surprised me was that restoring previous backups and going back a couple of software versions didn't bring it back.
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