I am seeing same thing plex dvr not working, no program guide.
Setup is two hdhomerun primes, running AMD 8 core/16GB, Linux mint 18.1
I disabled enhanced guide
I removed both Hdhomeruns and re-added.
Restarted Plex Media Service
Reboot entire Plex server
Restarted Both hdhomeruns
I see in the logs it might be an issues with SQLlite DB and JSON processing:
Jun 01, 2017 21:43:21.871 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.874 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.877 [0x7fa569bf7700] ERROR - SQLITE3:0x10, 1, duplicate column name: grandparent_guid
Jun 01, 2017 21:43:21.877 [0x7fa569bf7700] ERROR - SQLITE3:0x10, 1, duplicate column name: originally_available_at
Jun 01, 2017 21:43:21.907 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.912 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.919 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.922 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.958 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.960 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
Jun 01, 2017 21:43:21.963 [0x7fa569bf7700] INFO - SQLITE3:0x10, 17, statement aborts at 57: [select * from metadata_items limit 1] database schema has changed
…8< Snipped out about 50 duplicate SQLITE errors as above 8<…
Jun 01, 2017 21:43:31.135 [0x7fa56abf9700] ERROR - LPE: unknown item 42005.
Jun 01, 2017 21:43:31.136 [0x7fa56abf9700] ERROR - Versions: failed to generate query for path library://fce38cb4-2bed-4103-a543-2b483cf107bf/item/%2Flibrary%2Fmetadata%2F42005
Jun 01, 2017 21:43:31.136 [0x7fa56abf9700] ERROR - Versions: skipping items for generator 9079: unable to generate version set query
Jun 01, 2017 21:43:31.209 [0x7fa56abf9700] ERROR - LPE: unknown item 42005.
Jun 01, 2017 21:43:31.210 [0x7fa56abf9700] ERROR - Versions: failed to generate query for path library://fce38cb4-2bed-4103-a543-2b483cf107bf/item/%2Flibrary%2Fmetadata%2F42005
Jun 01, 2017 21:43:31.210 [0x7fa56abf9700] WARN - Versions: generator SOLOMON KANE has an empty version set query, assuming generator is no longer valid
Jun 01, 2017 21:43:46.690 [0x7fa5743ff700] WARN - PubSub: Received notifyConnectivity event with incorrect async identifier (97f5b715-ebf2-486d-9b7d-2349a40d5a7a, expected 5633bf84-51d8-42d1-9de2-bc64c674046b)
Jun 01, 2017 21:43:47.060 [0x7fa569bf7700] ERROR - EPG: JSON parse error.
Jun 01, 2017 21:43:47.060 [0x7fa569bf7700] WARN - EPG[onconnect]: Failed to load EPG.