Bukkit

What steps will reproduce the problem?
1. Spawn villagers with eggs in creative mode with plugin active.
2. Disable plugin.
3. Spawn villagers with eggs in creative mode with plugin inactive.

What is the expected output? What do you see instead?
Without the plugin, spawn eggs produce random professions.  With the plugin, spawn eggs always produce farmers.

What version of the product are you using?
'Jenkins' build #30

Do you have an error log of what happened?
Minecraft Remote Toolkit R10 Alpha 13.2
Initializing...
Loading toolkit properties...Done.
Loading toolkit modules...Done.
Wrapper is running on: Linux 3.5.0-21-generic amd64
Starting wrapper...
Starting UDP listen server on port 25561
Dec 28, 2012 10:08:03 AM net.wimpi.telnetd.net.PortListener run
INFO: Listening to Port 25,561 with a connectivity queue size of 5.
210 recipes27 achievements2012-12-28 10:08:04 [INFO] Starting minecraft server version 1.4.6
2012-12-28 10:08:04 [INFO] Loading properties
2012-12-28 10:08:04 [INFO] Default game type: SURVIVAL
2012-12-28 10:08:04 [INFO] Generating keypair
2012-12-28 10:08:05 [INFO] Starting Minecraft server on *:25565
2012-12-28 10:08:06 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.6-R0.1-b2561jnks (MC: 1.4.6) (Implementing API version 1.4.6-R0.1)
2012-12-28 10:08:07 [INFO] ----- Bukkit Auto Updater -----
2012-12-28 10:08:07 [INFO] It appears that you're running a Beta Build, when you've specified in bukkit.yml that you prefer to run Recommended Builds.
2012-12-28 10:08:07 [INFO] If you would like to be kept informed about new Beta Build releases, it is recommended that you change 'preferred-channel' in your bukkit.yml to 'beta'.
2012-12-28 10:08:07 [INFO] With that set, you will be told whenever a new version is available for download, so that you can always keep up to date and secure with the latest fixes.
2012-12-28 10:08:07 [INFO] If you would like to disable this warning, simply set 'suggest-channels' to false in bukkit.yml.
2012-12-28 10:08:07 [INFO] ----- ------------------- -----
2012-12-28 10:08:07 [INFO] [PistonChest] Loading PistonChest v1.7.0.4
2012-12-28 10:08:07 [INFO] [WorldBorder] Loading WorldBorder v1.6.1
2012-12-28 10:08:07 [INFO] [SilkSpawners] Loading SilkSpawners v3.0 BETA 2
2012-12-28 10:08:07 [INFO] [MobCatcher] Loading MobCatcher v3.3
2012-12-28 10:08:07 [INFO] [EnderHome] Loading EnderHome v0.1
2012-12-28 10:08:07 [INFO] [PermissionsBukkit] Loading PermissionsBukkit v1.6
2012-12-28 10:08:07 [INFO] [Rebalance Villagers] Loading Rebalance Villagers v1.4-SNAPSHOT
2012-12-28 10:08:07 [INFO] [MobArena] Loading MobArena v0.94.4.83
2012-12-28 10:08:07 [INFO] [TreeAssist] Loading TreeAssist v5.0
2012-12-28 10:08:07 [INFO] [RemoteToolkitPlugin] Loading RemoteToolkitPlugin v0.61
2012-12-28 10:08:07 [INFO] [Essentials] Loading Essentials vPre2.9.6.3
2012-12-28 10:08:07 [INFO] [EssentialsProtect] Loading EssentialsProtect vPre2.9.6.3
2012-12-28 10:08:07 [INFO] MLog clients using java 1.4+ standard logging.
2012-12-28 10:08:07 [INFO] [EssentialsSpawn] Loading EssentialsSpawn vPre2.9.6.3
2012-12-28 10:08:07 [INFO] [EssentialsChat] Loading EssentialsChat vPre2.9.6.3
2012-12-28 10:08:07 [INFO] Preparing level "orgserver"
2012-12-28 10:08:08 [INFO] Preparing start region for level 0 (Seed: 6168998067453653590)
2012-12-28 10:08:09 [INFO] Preparing spawn area: 28%
2012-12-28 10:08:09 [INFO] Preparing start region for level 1 (Seed: 8551419696541737730)
2012-12-28 10:08:10 [INFO] Preparing spawn area: 8%
2012-12-28 10:08:10 [INFO] Preparing start region for level 2 (Seed: 8551419696541737730)
2012-12-28 10:08:11 [INFO] Preparing spawn area: 40%
2012-12-28 10:08:11 [INFO] [PistonChest] Enabling PistonChest v1.7.0.4
2012-12-28 10:08:11 [INFO] [PistonChest] Metrics Enabled
2012-12-28 10:08:11 [INFO] [PistonChest] Connected to DB
2012-12-28 10:08:11 [INFO] [WorldBorder] Enabling WorldBorder v1.6.1
2012-12-28 10:08:11 [INFO] [WorldBorder] [CONFIG] Using round border, knockback of 3.0 blocks, and timer delay of 5.
2012-12-28 10:08:11 [INFO] [WorldBorder] [CONFIG] Border-checking timed task started.
2012-12-28 10:08:11 [INFO] [WorldBorder] [CONFIG] World "orgserver" has border radius 6000 at X: 0.0 Z: 0.0 (shape override: round)
2012-12-28 10:08:11 [INFO] For reference, the main world's spawn location is at X: -1.0 Y: 63.0 Z: -1.0
2012-12-28 10:08:11 [INFO] [SilkSpawners] Enabling SilkSpawners v3.0 BETA 2
2012-12-28 10:08:12 [INFO] [SilkSpawners] Spout not found. Disabling Spout features.
2012-12-28 10:08:12 [INFO] [MobCatcher] Enabling MobCatcher v3.3
2012-12-28 10:08:12 [INFO] [MobCatcher] Author: Malikk
2012-12-28 10:08:12 [INFO] [MobCatcher] Vault was not found.
2012-12-28 10:08:12 [INFO] [MobCatcher] Spout was not found.
2012-12-28 10:08:12 [INFO] [MobCatcher] remove stackability: true
2012-12-28 10:08:12 [INFO] [MobCatcher] signData File is Empty
2012-12-28 10:08:12 [INFO] [MobCatcher] Loading 12 mob data
2012-12-28 10:08:12 [INFO] [MobCatcher] Starting Plugin Metrics
2012-12-28 10:08:12 [INFO] [MobCatcher] Enabled
2012-12-28 10:08:12 [INFO] [EnderHome] Enabling EnderHome v0.1
2012-12-28 10:08:12 [INFO] [EnderHome] EnderHome is now active
2012-12-28 10:08:12 [INFO] [PermissionsBukkit] Enabling PermissionsBukkit v1.6
2012-12-28 10:08:12 [INFO] [PermissionsBukkit] Enabled successfully, 0 players registered
2012-12-28 10:08:12 [INFO] [Rebalance Villagers] Enabling Rebalance Villagers v1.4-SNAPSHOT
2012-12-28 10:08:12 [INFO] [Rebalance Villagers] Existing villagers have been reloaded as BalancedVillagers.
2012-12-28 10:08:12 [INFO] [MobArena] Enabling MobArena v0.94.4.83
2012-12-28 10:08:13 [WARNING] [MobArena] Vault was not found. Economy rewards will not work!
2012-12-28 10:08:14 [INFO] [MobArena] v0.94.4.83 enabled.
2012-12-28 10:08:14 [INFO] [TreeAssist] Enabling TreeAssist v5.0
2012-12-28 10:08:14 [INFO] [RemoteToolkitPlugin] Enabling RemoteToolkitPlugin v0.61
2012-12-28 10:08:14 [INFO] Memory max: 3087007744 bytes
2012-12-28 10:08:14 [INFO] Memory total: 3087007744 bytes
2012-12-28 10:08:14 [INFO] Remote Toolkit Plugin V0.61 enabled!
2012-12-28 10:08:14 [INFO] [Essentials] Enabling Essentials vPre2.9.6.3
2012-12-28 10:08:15 [INFO] Essentials: Using PermissionsBukkit based permissions.
2012-12-28 10:08:15 [INFO] [EssentialsProtect] Enabling EssentialsProtect vPre2.9.6.3
2012-12-28 10:08:15 [INFO] Initializing c3p0-0.9.1.2 [built 21-May-2007 15:04:56; debug? true; trace: 10]
2012-12-28 10:08:16 [INFO] [EssentialsSpawn] Enabling EssentialsSpawn vPre2.9.6.3
2012-12-28 10:08:16 [INFO] [EssentialsChat] Enabling EssentialsChat vPre2.9.6.3
2012-12-28 10:08:16 [INFO] Server permissions file permissions.yml is empty, ignoring it
2012-12-28 10:08:16 [INFO] Done (8.969s)! For help, type "help" or "?"
2012-12-28 10:08:16 [WARNING] Method "public Plugin loadPlugin(File, boolean)" is Deprecated, and may be removed in a future version of Bukkit
org.bukkit.plugin.AuthorNagException:
    at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:284)
    at com.earth2me.essentials.storage.BukkitConstructor.getClassForNode(BukkitConstructor.java:418)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.getConstructor(Constructor.java:321)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:331)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:183)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:142)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:128)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:423)
    at com.earth2me.essentials.storage.YamlStorageReader.load(YamlStorageReader.java:47)
    at com.earth2me.essentials.storage.AbstractDelayedYamlFileReader.run(AbstractDelayedYamlFileReader.java:37)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftTask.run(CraftTask.java:53)
    at org.bukkit.craftbukkit.v1_4_6.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
Bukkit RTK plugin found! Enabling heartbeats...

Please provide any additional information below.
I have not modified offers.yml or config.yml from default.