Tell me more.
I learned about that thanks to BONKERS' post here:
One last thing to do is, make a Final Fantasy XIII profile in Nvidia Inspector (Follow this image to get to the right place)and add "ffxiimg.exe" to it. And enable the "Antialiasing Fix" Shown in this screenshot. This will prevent a macroblock like artifact from appearing on the hair of characters. Even with In game MSAA. Hit "Apply Changes" when done.
I had noticed the artifact on Lightning's hair when turning the camera around but I had no idea what it was or how to fix it until I read that post by BONKERS. I had to remove the FFXIII profile from the nvidia control panel to get the inspector profile to work though, since initially the fix was doing nothing.