I've tested this on some mules now. I entered the Arena in Izlude (right building on the island) and all was fine. I left and it warped me to the bridge below Criatura Academy and forced me to DC. I can no longer log onto those characters since I dc as soon as the map loads.
I saw at least 5 novice in there, this isn't a good place to have a bug like that. The place you are sent when you leave needs to be changed from it's old location (pre Izlude change) and to its new one.