attempt to track down some bugs

src/main/java/net/minecraft/server/World.java

@@ -203,6 +203,12 @@ public class World implements IBlockAccess {
             }
             result = lastChunkAccessed;
         }
+        if(result.j != i || result.k != j) {
+            if(this instanceof WorldServer) {
+                WorldServer ws = (WorldServer) this;
+                MinecraftServer.a.severe("Chunk fetched was not the chunk requested.");
+            }
+        }
         return result;
     }
     // CraftBukkit end