Other alternatives are to use Arena plugins (which usually cost, and I don't think...
Turn save off, then just use an alternative plugin. Thats the most simple answer.
Try using EssentialsX instead of Essentials ( https://www.spigotmc.org/resources/essentialsx.9089/ )
These forums are not dead. I don't know why though.
Just face it guys. Bukkit is dead and it might not ever come back.
Just add a new prefix [SOLVED]
Get WorldGuard and set regions for specific mobs
If you really want to keep the world then I dont know. The only thing i can think of is deleting the enitites.dat in your worlds folder
because spigot dosent support @p/@a/ect with custom commands. The owner of the plugin has to of set it first.
Because you need to set permissions mirroring from different worlds.
You've missed out on the news. They are working on the 1.8 right now. They are just trying to get rid of the DCMA :D
Separate names with a comma.