Fix "Internal server error".

src/minecraft/net/minecraft/src/PlayerManager.java

@@ -181,9 +181,9 @@ public class PlayerManager
 //        int var2 = (int)par1EntityPlayerMP.posX >> 4;
 //        int var3 = (int)par1EntityPlayerMP.posZ >> 4;
 
-        for (int var4 = this.playerViewDistance; var4 <= this.playerViewDistance; ++var4)
+        for (int var4 = -this.playerViewDistance; var4 <= this.playerViewDistance; ++var4)
         {
-            for (int var5 = this.playerViewDistance; var5 <= this.playerViewDistance; ++var5)
+            for (int var5 = -this.playerViewDistance; var5 <= this.playerViewDistance; ++var5)
             {
                 PlayerInstance var6 = this.getOrCreateChunkWatcher(var2.add(BigInteger.valueOf(var4)), var3.add(BigInteger.valueOf(var5)), false);
 
@@ -238,7 +238,7 @@ public class PlayerManager
 
                         if (!this.func_72684_a(var15.subtract(var13), var16.subtract(var14), var2, var3, var12))
                         {
-                            PlayerInstance var17 = this.getOrCreateChunkWatcher(var15, var16, false);
+                            PlayerInstance var17 = this.getOrCreateChunkWatcher(var15.subtract(var13), var16.subtract(var14), false);
 
                             if (var17 != null)
                             {