SOLVED: Jellyfin Media Player Linux never shows subtitles

[eobet]

Yes, thank you, as I mentioned, when I uninstalled flatpak I left the configs intact hoping to be able to reuse them. However, I've now tested to point the jellyfin.env to the flatpak folders and systemctl tells me that jellyfin then fails to start.

So, starting from scratch it is, and after restoring the jellyfin.env (from backup) and restarting my machine, I get this far when I just click next (as I plan to just run it locally, allowing no incoming connections):

   

I can wait forever and the spinning won't stop, and if I reload the page, the process starts over. Flatpak version did not have this issue.

System ctl status (and log as well) has only this to say:

jun 14 23:51:18 leplup jellyfin[3316]: [23:51:18] [INF] Core startup complete
jun 14 23:51:18 leplup jellyfin[3316]: [23:51:18] [INF] Startup complete 0:00:03.1358426
jun 14 23:51:20 leplup jellyfin[3316]: [23:51:20] [INF] Clean up collections and playlists Completed after 0 minute(s) and>
jun 14 23:51:21 leplup jellyfin[3316]: [23:51:21] [INF] Update Plugins Completed after 0 minute(s) and 1 seconds
jun 14 23:51:43 leplup jellyfin[3316]: [23:51:43] [INF] Saving system configuration
jun 14 23:51:43 leplup jellyfin[3316]: [23:51:43] [INF] Setting cache path: /var/cache/jellyfin
jun 14 23:51:43 leplup jellyfin[3316]: [23:51:43] [INF] Stopping NAT discovery
jun 14 23:51:43 leplup jellyfin[3316]: [23:51:43] [WRN] No users, creating one with username jellyfin
jun 14 23:56:07 leplup jellyfin[3316]: [23:56:07] [INF] Saving system configuration
jun 14 23:56:07 leplup jellyfin[3316]: [23:56:07] [INF] Setting cache path: /var/cache/jellyfin