As title states the Antialiasing is broken after updating to windows 11.
Back on 10 i had 8x in settings, after update to 11 if there is any selected if it be 2,4 or 8 the game just black screens.
Quick fix is to go in Preferences.ini and make sure to remove the value (this disables it in game)
Once in leave it disabled due to as soon as you even try applying it again the game will just black screen.
I had the same problem after re-installing the game during their 15th anniversary event. It took a couple of days but here is what worked for me. Go into SETTINGS -> SYSTEM -> DISPLAY -> GRAPHICS -> FIND lotroclient64 -> SELECT: High performance -> *most important stop now* CHECK OFF: Don't Use Auto HDR. I then went into game and put everything on ultra high graphics, and even ultra wide monitor setttings 3440x1440 with 8x Anti Aliasing and finally no more black screen.
I had the same problem after re-installing the game during their 15th anniversary event. It took a couple of days but here is what worked for me. Go into SETTINGS -> SYSTEM -> DISPLAY -> GRAPHICS -> FIND lotroclient64 -> SELECT: High performance -> *most important stop now* CHECK OFF: Don't Use Auto HDR. I then went into game and put everything on ultra high graphics, and even ultra wide monitor setttings 3440x1440 with 8x Anti Aliasing and finally no more black screen.