I have no idea how how I got this tbh.. But today, when I landed at warcamp in Ostland on my Zealot, my screen froze, but I kept walking as nothing happen.
However, to my huge surprise, when I got to a keep in RvR zone.. It was not there. All npc were, and cannons, but walls were gone for me, and only me.
I must say it was yet funniest bug to abuse, being able to DPS and rez people trough the walls.
Here is screenie:
Would be fun if anyone could figure out how to get this. I had all graphics on max, except for shadows, which were on medium. Forced AA and AF.