I have the YAPP plugin and non-ops can vote and leave and stuff but can't actually join arenas. Here's my config

+ sg.arena.vote
+ sg.arena.leave
+ sg.join
+ sg.arenas.join.1
+ sg.arenas.join.2
+ sg.arenas.join.*
+ sg.arena.vote
+ sg.arena.spectate
+ sg.lobby.join
+ essentials.afk
+ essentials.afk.auto
+ essentials.back
+ essentials.back.ondeath
+ essentials.balance
+ essentials.balance.others
+ essentials.balancetop
+ essentials.build
+ essentials.chat.color
+ essentials.chat.format
+ essentials.chat.shout

+ essentials.chat.question
+ essentials.clearinventory
+ essentials.compass
+ essentials.depth
+ essentials.delhome
+ essentials.getpos
+ essentials.geoip.show
+ essentials.help
+ essentials.helpop
+ essentials.home
+ essentials.home.others
+ essentials.ignore
+ essentials.info
+ essentials.itemdb
+ essentials.list
+ essentials.mail
+ essentials.mail.send
+ essentials.me
+ essentials.motd
+ essentials.msg
+ essentials.msg.color
+ essentials.near
+ essentials.pay
+ essentials.ping
+ essentials.protect
+ essentials.r
+ essentials.rules
+ essentials.realname
+ essentials.seen
+ essentials.sell
+ essentials.sethome
+ essentials.setxmpp
+ essentials.signs.create.protection
+ essentials.signs.create.trade
+ essentials.signs.create.trade
+ essentials.signs.break.trade
+ essentials.signs.use.balance
+ essentials.signs.use.buy
+ essentials.signs.use.disposal
+ essentials.signs.use.enchant
+ essentials.signs.use.free
+ essentials.signs.use.gamemode
+ essentials.signs.use.heal
+ essentials.signs.use.info
+ essentials.signs.use.kit
+ essentials.signs.use.mail
+ essentials.signs.use.protection
+ essentials.signs.use.repair
+ essentials.signs.use.sell
+ essentials.signs.use.time
+ essentials.signs.use.trade
+ essentials.signs.use.warp
+ essentials.signs.use.weather
+ essentials.spawn
+ essentials.suicide
+ essentials.time
+ essentials.tpa
+ essentials.tpaccept
+ essentials.tpahere
+ essentials.tpdeny
+ essentials.warp
+ essentials.warp.list
+ essentials.world
+ essentials.worth
+ essentials.xmpp
+ sg.signs.sg.arenas.join.*
+ yapp.build