Can't find a solution? Please help; VITAL

So I have a small Bukkit server, and just recently, including myself, all players have stopped taking fall damage. I can't find any variable that I've changed that would have caused this. My plugins:
AlphaChest
Announcer
AutoSaveWorld
BlazeOfGlory
BorderGuard
BowEnchantments
Buycraft
ChatProtection+
ClearLag
CombatLog
DisableMessage
Essentials
ExplodingEggs
Factions
floAuction
FrameProtect
GAListener
HealthBar
iConomy
LightningStick
Lottery
Multiverse-Core
NametagEdit
NoCheatPlus
ObsidianDestroyer
PermissionsEx
PluginMetrics
Potion Staffs
PressurePush
PvPTimer
SetRankPEX
SilkSpawners
SimpleAutoAnnouncer (I know I have 2 announcer's I should take one out)
SimpleRestart
Spectate
TimTheEnchanter
Updater
Vanilla
Vote
Votifier
WhatIsIt
WorldEdit
WorldGuard

If you need me to copy/paste a config, just tell me. Please help

 

Although I'm unable to help you with this problem... You would probably have a better chance of finding someone who can help if you change the title of this thread to "players not taking fall damage" or something of the sort.

 

WorldGuard has an option to turn fall damage on and off.
Go into the config, and under player damage there's a line:
disable-fall-damage: false