I think based off your comment in the other thread you did something wrong when it comes to installing the addon fix. I replied in that thread to it trying to help you figure out what it is…
Pasting the reply here for visibility in case anyone else needs to see the complete steps.
Did you unzip the file you download and place it inside the addons folder? You cant just download it and place it in there.
Did you confirm the addon shows up on your addon list in game? If it does not you did something wrong. You made need to click load anyway or something.
When making the addon it should look like this on the site
https://i.imgur.com/gFlZmO9.png Then you download it. Unzip the file. then place the “MSAA Fix” folder in your World of Warcraft>Retail>Interface>Addons folder.
After that confirm the addon is Enabled in game. If the Addon Making website looks just like this https://i.imgur.com/gFlZmO9.png and you confirm the addon shows up on you addon list in game and has a checkmark next to it. You should see this. https://i.imgur.com/IMuelTh.png This way you know its actually loading. After that you should be all set. If you do not see it on your addon list in game with a check mark you did something wrong.
It 100% works I use it daily. As a side note the addon wont fix the issue until you log into a toon. It wont be fixed on the character select screen