Can't talk on my server even with OP status

I was playing on my server a few days ago, perfectly normal, and then recently I noticed that I cannot talk, all commands are issued successfully, but any chat message I send is not even received by the server. I have chat enabled in my options (I don't think I could even do commands if it wasn't) and I have OP and am in the Staff group with the appropriate permission nodes, so does anybody have any idea what has happened?

Minecraft version 1.7.4, Bukkit Version:
git-Bukkit-1.7.2-R0.2-3-g530fcb7jnks (MC: 1.7.2)
(Implementing API version 1.7.2-R03-SNAPSHOT)

EMail address: [email protected]

 

Paste startup log or list plugins please.

 

Can you please tell us what plugins you are using? Off the top of my head I know that the VanishNoPacket plugin can cause this since you log on/off vanished and by default it will not allow chat to go through in vanish mode.

If we know what plugins you are running we might be able to more accurately tell you.

 

This problem is fixed temporarily by deleting all user data from the server (ie. plugins/Essentials/userdata/LordMarkXD.ymlworld/players/LordMarkXD.dat) but is not a permanent solution as it has returned several times after

Plugins (41): Sonic Screwdriver, GroupManager, PlugMan, WorldEdit, TARDISHorseSpeed, SyncDoors, WhiteMessage, DiscoverWarps, Vault, Multiverse-Core, Craft Inc. Gates, HarryPotterSpells, WorldGuard, MobileAdmin, RemoteToolkitPlugin, dynmap, OpenPlayerInventory, TeleParticles, JukeBoxGUI, Cannons, TARDISChunkGenerator, OpenInv, HarryPotterHousePoints, ProtocolLib, Herochat, ImageOnMap, SimpleTickets, Essentials, Citizens, TARDIS, Dynmap-Essentials, EssentialsSpawn, Multiverse-Portals, Enjin Minecraft Plugin, Smileychat, JSONAPI, EchoPet, Dynmap-Herochat, CraftBook, BKCommonLib, Train Carts
I can provide a link to any of the above BukkitDev pages if necessary on request

 

LordMarkXD Startup log please.

 

LordMarkXD
is this issue with you or everyone?

Don't mean to sound stupid but are you sure in options -> multiplayer settings - chat: shown
is correct?