Sometime around Oct 22, my DVR stopped recording. My first inkling that something was wrong was my difficulty in connecting to the server (a Mac Pro) from my iOS devices. I was on the beta update channel and a new release just installed. Guide seemed to work, recordings were scheduled, but none appeared. Logs showed “transcode errors” amongst others, and recordings were all aborted. Read forums, someone said it was a bug and they fixed it by removing antenna channels and updating guide and restoring channels and updating guide, others said it was because recording quality had to be set to “Any” due to EPG problems, and others said one had to wait for the Plex team to fix it. I tried all of these fixes, except for waiting 
and after uninstalling, reinstalling, resetting up entirely and so on, went nuclear. Long story short: this worked and full functionality is back. The problem was not a bug in the present Public PMS, but it was a problem in the interaction between what the Beta PMS setup and how the new updates reacted with it.
This is how I resolved the problem: I located each place where Plex was installed (in Applications, Library-Applications Support, Caches, and preferences, and one by one restored these folders (and file) using Time Machine by going back to October 21st, just before the DVR stopped working. After this I restarted and Plex loaded automatically. I ran the web interface and saw that mostly it was working except for the guide which was spinning around unable to initialize. I redid the guide settings. I signed out of Plex, quit Plex, then downloaded and installed the latest safe version of PMS and started it up. All was well and the Guide updated nicely. I then restored whatever was missing from the recording schedule and waited for the next day when it should record and voila! It did! There are still some artifacts of malfunction but they are minor.
