when entering server on 0.52 stable, I got graphics artifacts, in my screen.
I get spawned into the game, I can walk and hear.. but I cant see.
the screen is just a blur with flickering stripes.

this is very annoying because the player is in the game and not able to defend him/herself from zombies / players.
it takes half a minute before the screen is fixed and works as intended.

uploaded a video on Youtube: https://www.youtube.com/watch?v=PkmmGgRMbp0