Hey there,
sorry for the late response…
I think the ~320 Episodes is not a real limit - i think it is a bug… Maybe in the TheTVDB Agent?
Yesterday, i have the problem again, with the series “CSI” (~330 Episodes?!).
So, the series was complete (well, complete for german episodes - not sure if it was real complete) and plex couldn’t load any metadata.
After all, i try something different:
I use the “Fix incorrect match”, wait for the Auto Match to suggest (only for security reasons), after that, i switch to “Search” and change the agent to “The Movie Database” and let it search.
After scanning, plex load the data of all series (it took ~30 minutes for one - i refresh the metadata for individual for every series, not all together)
After that, i have the metadata for all 3 series (CSI, Simpsons, Pokemon) - not sure if they are all correct, but it looks so…
Maybe it was only luck or something… But it could be worth a try…
I’ll try it. I was so pissed at my computer and how it’s been behaving I completely wiped it back down to just windows and started over. After the 10TB of data loads I’ll figure out where I stand. It will have all night/day to work until I get home from work tomorrow and I will evaluate. I will try your method @malacay1462 if it has still not loaded by that time. I’ll post tomorrow on my status. Goodnight all!
@ChuckPa and @malacay1462. That was the answer. It worked and uploaded everything. I will go through with a fine tooth comb tomorrow to make sure every file uploaded properly but everything has images and looks gorgeous! Thanks for your help!!!
@malacay1462 said:
Hey there,
sorry for the late response…
I think the ~320 Episodes is not a real limit - i think it is a bug… Maybe in the TheTVDB Agent?
Yesterday, i have the problem again, with the series “CSI” (~330 Episodes?!).
So, the series was complete (well, complete for german episodes - not sure if it was real complete) and plex couldn’t load any metadata.
After all, i try something different:
I use the “Fix incorrect match”, wait for the Auto Match to suggest (only for security reasons), after that, i switch to “Search” and change the agent to “The Movie Database” and let it search.
After scanning, plex load the data of all series (it took ~30 minutes for one - i refresh the metadata for individual for every series, not all together)
After that, i have the metadata for all 3 series (CSI, Simpsons, Pokemon) - not sure if they are all correct, but it looks so…
Maybe it was only luck or something… But it could be worth a try…
Flipping agents around is not a real solution. What’s happening is the internal flags are being toggled and clearing what’s actually getting stuck. Toggling agent selection to clear a flag does make sense. That is a GREAT piece of info 
As for the ‘hard limit’. I have over 7000 episodes in my library and can rebuild all of it without issue. The key appears to be when retrieving for a single series. I can retrieve a number of full series which have 180-200 episodes without incident.
Everyone’s input is VERY VERY VERY valuable and HELPFUL! We will get this figured out
I don’t know if is usefull but I was havibg your problems with one piece and naruto (600+)
I noticed that if I force refresh of show and don’t navigate in his library in a reasonable amont of tine all where downloaded…
When force refresh I go to status section and wait to download finiah notification…
@malacay1462, thanks for the suggestion it seems to have sorted out my issue.
I can’t believe it was so simple 
I had been been playing around all weekend, trying all sorts to get my metadata to show.
I went to my ‘series’, then selected match > auto match > Personal Media Shows and then lo and behold all my files have the correct metadata
While I agree with @chuckpa, it is a workaround, not a solution. As Plex should be able to get the metadata on the initial scan.
So if I can replicate it again I will post some logs.
Although I do see this in my Plex Media Scanner log (on OSX):
ERROR - MediaInspectorMediaInfo: unable to cast 'Unable to load libmediainfo.0.dylib'
WARN - MediaInfo and FFmpeg disagree on the number of video streams in the file (ffmpeg: 1, mediainfo: 0)
WARN - MediaInfo and FFmpeg disagree on the number of audio streams in the file (ffmpeg: 1, mediainfo: 0)
But it is probably completely unrelated, as I think that’s only happening on OS X and the scanning problems seem to be on most if not all platforms.
@ChuckPa, I have some logs from a recent scan,.
All the files have embedded metadata, and images, but plex has not pulled in any images (embedded or tvdb) and some files are not displaying the embedded metadata.
would it be ok to send them to you via pm?
Before you even do that, Check your Agent settings in that library for “Local Media Assets”. Embedded Metadata and images will override everything when configured that way.
Check this out first please. https://support.plex.tv/hc/en-us/articles/200220717-Local-Media-Assets-TV-Shows
