Bukkit

What steps will reproduce the problem?
1. use group manager. Set the following permissions to a specific group, in my case, VIP:
- sc.blackjack.create
- sc.blackjack.info
- sc.blackjack.deposit
- sc.blackjack.withdraw
- sc.blackjack.delete
2. Set the player as NOT OP
3. When trying to withdraw and/or to destroy the table, you can not.

What is the expected output? What do you see instead?
table destroyed. You can't destroy ("wiithdraw") from the table. Or something like that. I do not remember.

What version of the product are you using?
1.4.1

Do you have an error log of what happened?
27.07 21:16:35 [Server] INFO ... 14 more
27.07 21:16:35 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)
27.07 21:16:35 [Server] INFO at java.lang.reflect.Method.invoke(Method.java:601)
27.07 21:16:35 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
27.07 21:16:35 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
27.07 21:16:35 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
27.07 21:16:35 [Server] INFO at com.brandenBoegh.SignCasino.Blackjack.BlackjackListener.onBlackJackDestroy(BlackjackListener.java:178)
27.07 21:16:35 [Server] INFO Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.block.CraftBlock cannot be cast to org.bukkit.block.Sign
27.07 21:16:35 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
27.07 21:16:35 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
27.07 21:16:35 [Server] INFO at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
27.07 21:16:35 [Server] INFO at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
27.07 21:16:35 [Server] INFO at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:83)
27.07 21:16:35 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
27.07 21:16:35 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
27.07 21:16:35 [Server] INFO at net.minecraft.server.Packet14BlockDig.handle(SourceFile:43)
27.07 21:16:35 [Server] INFO at net.minecraft.serverhook.NetServerHandlerProxy.a(NetServerHandlerProxy.java:114)
27.07 21:16:35 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:540)
27.07 21:16:35 [Server] INFO at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:175)
27.07 21:16:35 [Server] INFO at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager.java:220)
27.07 21:16:35 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)
27.07 21:16:35 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
27.07 21:16:35 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304)
27.07 21:16:35 [Server] INFO org.bukkit.event.EventException
27.07 21:16:35 [Server] SEVERE Could not pass event BlockBreakEvent to Sign Casino Blackjack

Please provide any additional information below.
Craftbukkir r 4.0 Minecraft 1.2.5
The slots work properly. Without sc.slots.delete