Ok, so recently mobbounty has stopped working (bare with me here), and when i examine the startup log I see an error for mobbounty but also, more importantly I see this error for vault:

15:12:32
CONSOLE:
[SEVERE] Error occurred while enabling Vault v1.2.19-b248 (Is it up to date?)
15:12:32
CONSOLE:
java.lang.ClassNotFoundException: ru.tehkode.permissions.commands.CommandListener

Plugins used:
AncientGates 1.3
Announcer 1.3.
"AntiGuest" "3.5-SNAPSHOT"
BKCommonLib 1.30
BOSEconomy 0.7.3.1
BlocksOnGlass 0.9 dev
ChestShop 3.46
ColoredSigns 1.2
CommandBook "2.1"
DeathTpPlus 3.9.16.2320
LWC 4.3.0 (b736-git-1b1150b1) (August 08, 2012)
LiftSign 0.2.1 -
LogBlock '1.52' -
LogBlockQuestioner 0.03
Lottery 0.8.1
BukkitCompat r20A
MOCDBLib 8 -
MOCPlaytimeTracker 0.8 -
MagicCarpet 2.2.2
MobBountyReloaded 291
Multiverse-Core 2.4-b527
Multiverse-Portals 2.5-b608
OpenInv 1.8.7
Parachute 0.2.2
PrivateWarp 1.7.1
SimpleChatChannels 0.7.4
Spectate 1.9.1
Train Carts 1.71.7
Vault 1.2.19-b248
VoidtoSpawn 1.0
WoolyJumper 1.0
WorldBorder 1.5.4
WorldEdit 5.4.2
WorldGuard "5.5.3"
bChatManager 2.0
bPermissions 2.9.23
dynmap "0.40-1180"
mcMMO 1.3.11-b1030
PluginControl 1.2.5

Closing, not enough information is provided to debug this.

thanks, I never thought it was a vault issue but didn't know what was causing vault to report that, what you told me has helped solve the issue (and correct it wasn't a vault issue - turned out to be liftsign messing everything up, bizarrely) .

I would have replied earlier to ask you to close this but i've been away till today, thanks anyway,

Cool, no problem! Glad you found the error, Happy Mining!

you have a plugin registering itself as PEX without having PEX installed. This shouldn't cause any problems other than an annoying error. Do you have the full error log? and does Vault continue to load despite the error?

this may not be an issue in Vault.