Thanks to both of you for your encouragement and assistance.
My experience with the Tablo has, over time, been generally favorable, enough that I have bought a second Tablo myself, and recommended the product to many others who seek my advice. It has taken literally several years for the product to stabilize, and still has numerous issues, but it is pretty solid. For whatever reason, firmware updates in general, and the latest one in particular, wreak havoc.
I am delighted to have (what appears to be) a smoothly working Tablo once again, but regret losing a batch of recorded files immediately after the upgrade, followed by a month or more of screwing around to eventually restore proper operation.
Those of us who are gadget freaks are altogether familiar with the continuing stream of firmware releases, and my six Tablo viewing locations each have Roku, AppleTV, some Nexus player, and other hardware demanding 20 or more devices in my house to be routinely updated. If I counted computers, tablets, thermostats, and all my other devices, the number would rise to nearly 60.
None of my other devices require factory reset after firmware upgrade to restore functionality. And my second Tablo was only slightly impacted, not requiring a factory reset. I guess I became spoiled by using OTA PVR systems in the prior period from the 1990s including Hauppage and then SageTV with very very few issues and never “pushed” updates. In defense of Tablo, they are trying to achieve a more complex agenda with many diverse platforms, corporate server intervention between client hardware recorders and players, etc. when it’s good it’s very very good, and when it’s bad it’s horrid....
Hope you are both enjoying excellent ‘golden years’ as retired EE’s. After a few beers, maybe we can see who can properly remember and describe Laplace Transforms or Nyquist criteria!