Universal Media Server | Forum

Doing a clean install should wipe all your settings and start anew.

You seem to have auto-load external subs as false so no external subs will show there.

Your subtitle language priority should be eng,und.

You don't need FriBiDi mode.

There's no reason to reinstall to make the installation "clean". Just rename or delete the folder "C:\ProgramData\UMS" - this is where all your settings are stored. I prefer renaming it to something else (e.g. "C:\ProgramData\UMS-bak"), because then it's easy to get your previous setup back if it didn't help. The next time UMS is started a new "UMS" folder will be created with default settings.