Resolution wont change

Hey, first off id like to say what a community this is and im excited to play WoTLK again as its been years. I tried changing the resolution to 1366x 768 but whenever i apply or 'ok' the changes it doesnt do anything. Edit: Im using the new wotlk server and tried using windowed maximized which made it bearable but the resolution still didnt change

wow.exe -> properties -> uncheck read only.
if that doesn't help, you could delete your config found from WoW/WTF/ -folder.

Then try to change them.