SOLVED: Black screen, w/ audio when playing video (web UI, 10.0.3)

[tk421_]

Hi, as the subject states video isn't working at all when using Jelllyfin Web.
I can hear audio but am only seeing a black screen.
This happens both when transcoding and direct playing, on both Firefox and Chrome, and both when accessing the server locally and through the Internet.
I'm running the server behind Caddy on a Kubuntu system (installed Jellyfin through the apt repository).
Ports 80 and 443 have been forwarded to the server and I made it accessible through a subdomain.

The Android client works perfectly fine, not sure about iOS (I don't have any Apple products).

See https://imgur.com/a/7oNEUKb for images of the issue + console output

Edit: Transcode log is at https://mystb.in/ba0eff24e6dfe9c09b

[Ted Hinklater]

I had this, uninstalled JF too just to realise the theme I was using had .preload set to "#000 !important" and it covered the player. Hope its that simple

[tk421_]

I had this, uninstalled JF too just to realise the theme I was using had .preload set to "#000 !important" and it covered the player. Hope its that simple

No way, it really was that simple!!!
Thanks for the help.