I was able to log-in by fiddling with my options as per Henrik's suggestion. Still, I'm going to say that there is a problem with Short Lion Capes and certain graphic settings. What happened to Djihad and his group had to be the equipping/wearing of a Short Lion Cape. I was watching this twitch video:
During the video one of the players equips their Short Lion Cape while they are roaming as a group. Almost immediately after it is equipped, they and the players around them crash simultaneously. I don't know the exact time of it right now, will fix later if i find out, but it should be near the 8-14 minute area perhaps.