Bukkit

config file:
name-format: '[$prefix+group$suffix&f] +name'
text-wrapping: false
censor-list: []
date-format: HH:mm:ss
message-format: $hb$lvl$prefixg &f$a<$ncc$prefix+displayname$suffix&f$a>&f $gcc$cc+message
nether-name: +world nether
log-everything: false
update-playerlist: false
death-format: '[$prefix+group$suffix&f] +name +message'
join-format: '&a+ join: &7$l$prefix+displayname$suffix'
quit-format: '&c- part: &7$l$prefix+displayname$suffix'
kick-format: '&eKICKED $prefix+displayname$suffix (+message)'

permissions file:
Not a permissions issue

server.log with log-everything to true:

Chatter works with chat great ingame...

At first on on any joins or parts this npe appears:

12:33:10 [SEVERE] java.lang.NullPointerException
12:33:10 [SEVERE]       at com.ensifera.animosity.craftirc.CraftIRC.delivery(CraftIRC.java:702)
12:33:10 [SEVERE]       at com.ensifera.animosity.craftirc.RelayedMessage.post(RelayedMessage.java:219)
12:33:10 [SEVERE]       at com.ensifera.animosity.craftirc.RelayedMessage.post(RelayedMessage.java:201)
12:33:10 [SEVERE]       at com.ensifera.animosity.craftirc.CraftIRCListener.onPlayerJoin(CraftIRCListener.java:87)
12:33:10 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
12:33:10 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
12:33:10 [SEVERE]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
12:33:10 [SEVERE]       at java.lang.reflect.Method.invoke(Method.java:616)
12:33:10 [SEVERE]       at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
12:33:10 [SEVERE]       at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
12:33:10 [SEVERE]       at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
12:33:10 [SEVERE]       at net.minecraft.server.ServerConfigurationManager.c(ServerConfigurationManager.java:132)
12:33:10 [SEVERE]       at net.minecraft.server.NetLoginHandler.b(NetLoginHandler.java:129)
12:33:10 [SEVERE]       at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:94)
12:33:10 [SEVERE]       at net.minecraft.server.Packet1Login.handle(SourceFile:68)
12:33:10 [SEVERE]       at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
12:33:10 [SEVERE]       at net.minecraft.server.NetLoginHandler.a(NetLoginHandler.java:48)
12:33:10 [SEVERE]       at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:61)
12:33:10 [SEVERE]       at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
12:33:10 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
12:33:10 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Then after I restarted once, Chatter prevents CraftIRC from relaying any chat to IRC, but joins/parts show up and no more npe. Nothing shows up in log for this.
Every server start since, Chatter still prevents craftirc from relaying any ingame chat.

What a bug, having to revert to 2.2.5 till this is fixed.

I don't care much if chatter tells craftirc what to do with join/part formatting, maybe make a option to disable that?

Using CraftIRC 3.6
Chatter 2.3
Vault 1.2.16
Bukkit #2175 (1.2.5-R1.3)
(also same results on Bukkit #2149 (1.2.5-R1))

Instead of the tag 'Minecraft' you need to use 'Chatter' in here:

  - source: 'Chatter'
    target: '<irctag>'

Aha, that fixes it.

Now to figure out why &f color shows up as black in IRC edit: thats a craftirc thing..nvm