I started doing my bukkit server with a friend all worked very well until I installed the mob arena, there we realized that the mobs do not atack us, then we begin to see what happened, then another player get inside to the server and strangely the mobs atack him. what happend? sorry for my english I am from Latin America
Might be you have a permission that stops you getting attacked? Try deop-ing yourself and see if that works?
