Language is Invalid and Changes Could not be Saved

Slight correction. C:\Users is not a hidden folder. The AppData folder within the directory with the username, however, is a hidden folder.

That folder contains all the metadata not stored in the DB for your server. So think posters, thumbnails and stuff like that. That adds up to a lot of smaller files (which tend to make deleting/copying slower) and a potentially decent size folder as you can see.

-Shark2k

It turns out that just deleting the “…\AppData\Local\Plex Media Server” folder is not enough because after uninstalling the PMS, deleting the folder, and reinstalling the PMS, I’m still having the exact same problem. I still can not add my “TV Show” folder.

How many folders did you select on the “Add Folders” tab?
What kind of targets? (UNC paths of network shares or local drives?)
Any specials characters in the folder names?

As much as I didn’t want to, I broke down and opened the Registry to delete the Registry Key.

Just when I thought I was getting a fresh start, I still could not save anything.

Just an additional note: I have two other Windows PMS that are both configured with the same libraries, pointing to the same SMB share that is on the same NAS drive that this PMS was configured with and I’m not having this problem with either of them.

Compare the installed browser add-ins.

I don’t understand. When I first ran into this problem, I was making the same changes to all three servers from the same browser. One of the other Windows server started out like it was going to have this problem but when I logged onto the local machine using 127.0.0.1 the problem went away. I tried the same on this machine and the problem remained. The only difference between the three Windows machines is that I had hard drive failures on the other two so those machines have been reformatted (at one time or another) with a fresh Windows install at least once, while this PC has never had a hard drive failure.

Is it possible that something else is still lingering from the previous install? I was thinking maybe I should have rebooted the PC between uninstalling, deleting the registry key, and reinstalling.

I reinstalled a second time but I’m still unable to add and save a library.

Multiple PMS Installs

I tried to make it as simple as I possibly could. I tried adding a Music library from my local hard drive and I’m still unable to save that library.

Something new. After this third install attempt, I’m now seeing a lot of certificate errors in my log. I’m not seeing these errors on any of my other PMS.

When looking closely at my logs while trying to add a simple Music library on my local hard drive, I noticed the use of ULA IPv6 Addresses and since I’m not sure how well the PMS application can support ULA addresses, I decided to turn IPv6 support off and reboot the PC.

It seems like turning off IPv6 support did the trick because I can now add libraries again.

I still have more work to do to get the PMS rebuilt back to where it was but at least now I’m making progress.

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Now that I’ve uninstalled and reinstalled my PMS, my Windows Plex apps automatically removed all references to the old PMS installs. However, my phone app does not. Is there another way to delete the old PMS references without having to uninstall the phone app and reinstall?

Never mind. It appears that the reference to the uninstalled PMS finally removed itself from my mobile phone.

That’s an interesting observation about the IPv6 support.
Thanks for investigating this!

Just Some Follow-Up: I’ve re-enabled IPv6 and I’m still able to add new libraries.

Just Another Note: I have not rebooted the PC since enabling IPv6 again. I’m taking my time in adding my libraries back because according to the logs this PMS is now working overtime.

I monitored the logs while adding a new library and even though I’ve enabled IPv6 again all the log activity I see now is happening over IPv4.

I’d recommend you to not re-enable IPv6 support, unless you know for certain that both your router and your ISP do fully support IPv6.

Another Follow-Up: You remember I mentioned that I have three Windows PMS and one of the other Windows PMS started out like it was going to have the same problem but it corrected itself after I rebooted and saved my library changes on the local PC using 127.0.01?

That PMS had IPv6 enabled also but I did find one thing that was different.

I fought the IPv6 battle with my ISP ten years ago. It just so happens that IPv6 is my primary responsibility. I have to get the Environmental Protection Agency (EPA) internal network IPv6-Only (without IPv4) functional in three years.

So my network does fully support IPv6