Error when trying to activate subtitles: "No Tracks"

Whenever I try to watch anything, I can't activate subtitles. It always says "No tracks".

I have some subtitles addons installed (yify, opensubtitles,etc...), and it all worked until today.

Does anyone know how to solve this? Already tried logging out and logging in again. Uninstalled and installed every addon again, still nothing.

Thanks in advance!