This issue has been present for me on at least the last two versions. I got so frustrated, that I completely deleted the Plex folder (/var/lib/plemediaserver) and rescanned everything again, where I noted it no longer scrapes for many things successfully scraped before.
Furthermore, the items ARE found and show up, can be played, just the metadata has not been retreived. Going into the individual item and manually 'matching' it, or refreshing it often is successful.
This appears to be happening to Music (Premium Library), Movies and TV shows sections.
e.g.
Bon Jovi is present in the music section (multiple albums), can be played but does not have metadata
One particular track is located /mnt/Audio/iTunes/iTunes Media/Music/Bon Jovi/Cross Road/01 Livin' On A Prayer 1.mp3
From the Activiy Log:
6:26 PM Library scan complete: Extra information may still be downloading from the Internet
6:25 PM Scanning the "Music" section
I have both verbose and debug logging enabled.
No results from the scanner log
cat Plex\ Media\ Scanner.log |grep "Bon jovi" or even using other parts of the word, just Jovi or jovi song titles.
After searching using the Plex search, it finds it successfully - I guess because it thinks it's already scanned.
Aug 25, 2016 18:40:36.629 [0x7f5dddffe700] VERBOSE - * query => bon jovi
Aug 25, 2016 18:40:36.630 [0x7f5dddffe700] DEBUG - Request: [192.168.43.110:61038] GET /hubs/search?sectionId=&query=bon%20jovi (12 live) TLS GZIP
Aug 25, 2016 18:40:36.718 [0x7f5dddffe700] DEBUG - Completed: [192.168.43.110:61038] 200 GET /hubs/search?sectionId=&query=bon%20jovi (12 live) TLS GZIP 87ms 1527 bytes (pipelined: 5)
Aug 25, 2016 18:40:36.831 [0x7f5dddffe700] VERBOSE - * query => bon jovi
Aug 25, 2016 18:40:36.832 [0x7f5dddffe700] DEBUG - Request: [192.168.43.110:61038] GET /hubs/search?query=bon%20jovi&limit=30 (12 live) TLS GZIP
Aug 25, 2016 18:40:36.911 [0x7f5dddffe700] DEBUG - Completed: [192.168.43.110:61038] 200 GET /hubs/search?query=bon%20jovi&limit=30 (12 live) TLS GZIP 78ms 3403 bytes (pipelined: 7)
Still metadata is not downloaded.
Manually I 'refresh' at the artist level and receive 'Downloading Metadata" message.
I now have artwork for every album, including premium data bio etc.
The Server logs are filled with similar to below.
Aug 25, 2016 18:45:11.663 [0x7f5dddffe700] VERBOSE - * q => Bon Jovi
Aug 25, 2016 18:45:11.663 [0x7f5dddffe700] DEBUG - Request: [127.0.0.1:49292] GET /services/vevo/search?q=Bon%20Jovi&artistsLimit=6&videosLimit=1 (19 live) GZIP
Aug 25, 2016 18:45:11.664 [0x7f5dddffe700] DEBUG - Completed: [127.0.0.1:49292] 200 GET /services/vevo/search?q=Bon%20Jovi&artistsLimit=6&videosLimit=1 (18 live) GZIP 0ms 262 bytes
Aug 25, 2016 18:45:11.725 [0x7f5dddffe700] VERBOSE - * artist => Bon Jovi
Aug 25, 2016 18:45:11.725 [0x7f5dddffe700] DEBUG - Request: [127.0.0.1:49318] GET /services/lyricfind/search?reqtype=default&searchtype=track&limit=100&output=json&artist=Bon%20Jovi&album=These%20Days%20Tour%20%2795%20%28Live%29 (19 live) GZIP
Aug 25, 2016 18:45:12.105 [0x7f5dddffe700] DEBUG - Completed: [127.0.0.1:49264] 200 GET /services/lyricfind/search?reqtype=default&searchtype=track&limit=100&output=json&artist=Bon%20Jovi&track=I%20Could%20Make%20A%20Living%20Out%20Of%20Lovin%27%20You (18 live) GZIP 997ms 1108 bytes
Aug 25, 2016 18:45:12.108 [0x7f5dddffe700] VERBOSE - * artist => Bon Jovi
Aug 25, 2016 18:45:12.108 [0x7f5dddffe700] DEBUG - Request: [127.0.0.1:49322] GET /services/lyricfind/search?reqtype=default&searchtype=track&limit=100&output=json&artist=Bon%20Jovi&track=Bonus%202 (19 live) GZIP
I am reluctant to upload entire logs, but for the Plex team, please advise what information I need to provide in order to resolve this. Thanks.