Got the following today with a reload of plugins

20:23:56 [SEVERE] Nag author: 'simplex' of 'Buildr' about the following: This plugin is not properly shutting down its async tasks when it is being reloaded. This may cause conflicts with the newly loaded version of the plugin

Am not aware I had loaded a new version it is the current one :

20:23:56 [INFO] [Buildr] Enabling Buildr v0.7.1
20:23:56 [INFO] [Buildr] loaded settings..
20:23:56 [INFO] [Buildr] Buildr v0.7.1 loaded

Not sure of this is of any help to you, please let me know if there is more to do. FYI server install is

20:32:49 [INFO] This server is running CraftBukkit version git-Bukkit-1.2.5-R1.0-b2149jnks (MC: 1.2.5) (Implementing API version 1.2.5-R1.0)

With the following plugins installed
20:33:29 [INFO] Plugins (16): Seen, Spectate, Buildr, tMOTD, DragonTravel, iZone,VanishNoPacket, PermissionsBukkit, eTeleport, Remover, GetPerms, Hawk, Catacombs, ChangeGameMode, Lift, MyWolf

The server is running on a Windows Vista 32 bit Service Pack 2 with Java 32 bit version V6 Update 31. Have allocated the maximum 1Gb memory to the running command. Lastly only about 2-3 users run on this it is a test server for us. We have a larger install based and plugins on a Linux system 64 it with more memory. The same message has not occured on there.

Regards
GordonT