problem with our bukkit server

Hello everyone,

Since the first 1.4 updates i got this problem with our world on our bukkit server.
For some reason when we log on random "canels" are generated through random places in the world.
They go 1 or 2 blocks through everything and are filled with water.
There are no error logs or anything so i have no clue what is causing these lines to generate randomly..
Hope anyone can explain what this is or how to solve it..
Here are 3 screenshots:

 

Leviathanss Can you provide your plugin list? I doubt it's anything to do with plugins, but we need to start somewhere to figure out the problem. My strongest guess is that it's simply bad world generation on your world. in what version did you generate this world?

 

We have 4 worlds running and that one that has the error is installed on 1.3 or 1.2 i believe.
Not 100% sure.
Here is a list of plugins. The hothgenerator is not linked to this world with the error.

List of plugins:
CityGates.jarDynmap-WorldGuard.jar
dynmap.jar
hothgenerator.jar
multiworld.jar
PerformanceMonitor.jar
SecretButton.jar
SecretSwitch.jar
Simple-AutoSave.jar
SimpleConceal.jar
Stargate-DHD.jar
Stargate.jar
WeatherMan.jar
WorldEdit.jar
WorldGuard.jar
World_Portal_0.2.5.jar

These ones were installed a week ago.
Essentials.jar
EssentialsAntiBuild.jar
EssentialsChat.jar
EssentialsGeoIP.jar
EssentialsGroupBridge.jar
EssentialsGroupManager.jar
EssentialsProtect.jar
EssentialsSpawn.jar
EssentialsXMPP.jar
Factions.jar
Lockette.jar
NoLagg.jar
SpamGuard.jar
Vault.jar ChestShop.jar

 

It looks like to me that someone is pranking your server

 

Nah We use a whitelist and the logs only show people on that would not be able to do that lol

 

Oh, I had this once!
And I never fixed it! I just moved onto a new map.
Try if it still generates canals if you remove all plugins? (rename the plugins folder to something else)

 

its the //fixwater command i think :I

 

i remember seeing a ticket on worldedit about it.