Problems with libraries

Today, after quite a long time not using plex, I had no media in my library.

When I logged into the web-ui it told me that the libraries needed to be upgraded. But I’m unable to upgrade the libraries.
Other forum-posts have said that the language needed to be set to english in order to be able to upgrade the library. But I can’t change any settings for the libraries.
I then tried to deleting the libraries, but I’m unable to delete the libraries.

I’m now considering if I should just delete the entire plex server, and start from scratch again.
But as a last resort, before I do that, I’m reaching out to you guys here. Have anybody heard of this before? And if so, what can be done about it?

I’m not quite sure how far you get with changing/deleting those information in your library (or if it’s all greyed out right from the start). Generally… if things get stuck that badly… it might be worth taking a look at the server logs to see if your database might have been corrupted.