SOLVED: CasaOS Jellyfin Installation - Lockup at Splash Screen

[TheDreadPirate]

I'm assuming you are using port 8097 in the URL when you access Jellyfin. Have you used this host with Jellyfin or Emby on that port before? Try clearing your browser cache?

For the record, you cannot change the port for 1900. That port is used for DLNA and is the port assignment is static. If you don't intend on using DLNA you can simply disable publishing of that port.