diff --git a/MekWarsClient/src/mekwars/client/io/FileSystem.java b/MekWarsClient/src/mekwars/client/io/FileSystem.java
index 628c5a75..06fe097a 100644
--- a/MekWarsClient/src/mekwars/client/io/FileSystem.java
+++ b/MekWarsClient/src/mekwars/client/io/FileSystem.java
@@ -17,18 +17,13 @@
 
 package mekwars.client.io;
 
-import java.io.IOException;
-import java.lang.IllegalArgumentException;
 import java.nio.file.FileSystems;
 import java.nio.file.Path;
 import mekwars.common.campaign.clientutils.IClientConfig;
-import mekwars.common.util.IOUtil;
-import mekwars.common.io.FileChecksum;
 import mekwars.common.io.AbstractFileSystem;
 
 public class FileSystem extends AbstractFileSystem {
     private Path configDir;
-    private Path campaignConfig;
 
     private static final String DIRECTORY_NAME_SERVERS = DIRECTORY_NAME_DATA + "servers/";
     private static final Path DIRECTORY_SERVERS = FileSystems.getDefault()
@@ -64,7 +59,6 @@ public Path getDataLastUpdated() {
      */
     public void setConfigDir(String configDir) {
         this.configDir = FileSystems.getDefault().getPath(configDir);
-        this.campaignConfig = FileSystems.getDefault().getPath(configDir, FILE_NAME_CAMPAIGN_CONFIG);
     }
 
     /**
@@ -89,20 +83,13 @@ public void setConfigDir(IClientConfig config) throws Exception {
 
         String configDirName = DIRECTORY_NAME_SERVERS + serverIp + "." + serverPort;
         this.configDir = FileSystems.getDefault().getPath(configDirName);
-        this.campaignConfig = FileSystems.getDefault().getPath(
-            configDir.getFileName().toString(),
-            config.getParam("CAMPAIGNCONFIG")
-        );
+        calculateChecksums();
     }
 
     public Path getConfigDir() {
         return configDir;
     }
 
-    public Path getCampaignConfig() {
-        return campaignConfig;
-    }
-
     public Path[] getDirectories() {
         return DIRECTORIES;
     }
diff --git a/MekWarsCommon/src/mekwars/common/io/AbstractFileSystem.java b/MekWarsCommon/src/mekwars/common/io/AbstractFileSystem.java
index f1a08407..54b46b11 100644
--- a/MekWarsCommon/src/mekwars/common/io/AbstractFileSystem.java
+++ b/MekWarsCommon/src/mekwars/common/io/AbstractFileSystem.java
@@ -78,7 +78,9 @@ public Path getOpList() {
      *
      * @return The path to the campaignconfig.txt file.
      */
-    public abstract Path getCampaignConfig();
+    public Path getCampaignConfig() {
+        return FileSystems.getDefault().getPath(getConfigDir().toString(), FILE_NAME_CAMPAIGN_CONFIG);
+    }
 
     /**
      * Returns The path to the directory that contains all shared configurations.
@@ -127,6 +129,7 @@ public ConcurrentHashMap<String, FileChecksum> getChecksumFiles() {
      * @throws IOException If there is an error in reading one of the files.
      */
     public void calculateChecksums() throws IOException {
+        checksumHash.clear();
         for (Path path : getConfigFiles()) {
             if (getFile(path.getFileName().toString()) == null && Files.exists(path)) {
                 FileChecksum fileChecksum = new FileChecksum(path);
diff --git a/MekWarsServer/src/mekwars/server/io/FileSystem.java b/MekWarsServer/src/mekwars/server/io/FileSystem.java
index 00390719..2cc07368 100644
--- a/MekWarsServer/src/mekwars/server/io/FileSystem.java
+++ b/MekWarsServer/src/mekwars/server/io/FileSystem.java
@@ -149,6 +149,7 @@ public static Path getOperationsLongDir() {
         return DIRECTORY_OPERATIONS_LONG;
     }
 
+    @Override
     public Path getCampaignConfig() {
         return FileSystems.getDefault().getPath(
             getConfigDir().toString(),