diff --git a/src/main/java/eu/crushedpixel/replaymod/ReplayMod.java b/src/main/java/eu/crushedpixel/replaymod/ReplayMod.java
index 28f75288..99c70ff3 100755
--- a/src/main/java/eu/crushedpixel/replaymod/ReplayMod.java
+++ b/src/main/java/eu/crushedpixel/replaymod/ReplayMod.java
@@ -4,6 +4,7 @@ import eu.crushedpixel.replaymod.api.client.ApiClient;
 import eu.crushedpixel.replaymod.chat.ChatMessageHandler;
 import eu.crushedpixel.replaymod.events.*;
 import eu.crushedpixel.replaymod.localization.LocalizedResourcePack;
+import eu.crushedpixel.replaymod.online.authentication.AuthenticationHandler;
 import eu.crushedpixel.replaymod.recording.ConnectionEventHandler;
 import eu.crushedpixel.replaymod.reflection.MCPNames;
 import eu.crushedpixel.replaymod.registry.KeybindRegistry;
@@ -83,6 +84,7 @@ public class ReplayMod {
     public void preInit(FMLPreInitializationEvent event) {
         config = new Configuration(event.getSuggestedConfigurationFile());
         config.load();
+        AuthenticationHandler.loadAuthkeyFromConfig();
 
         uploadedFileHandler = new UploadedFileHandler(event.getModConfigurationDirectory());
 
diff --git a/src/main/java/eu/crushedpixel/replaymod/api/client/ApiClient.java b/src/main/java/eu/crushedpixel/replaymod/api/client/ApiClient.java
index 6a462411..078779dd 100755
--- a/src/main/java/eu/crushedpixel/replaymod/api/client/ApiClient.java
+++ b/src/main/java/eu/crushedpixel/replaymod/api/client/ApiClient.java
@@ -25,6 +25,7 @@ public class ApiClient {
         QueryBuilder builder = new QueryBuilder(ApiMethods.login);
         builder.put("user", username);
         builder.put("pw", password);
+        builder.put("mod", true);
         AuthKey auth = invokeAndReturn(builder, AuthKey.class);
         return auth;
     }
@@ -38,9 +39,21 @@ public class ApiClient {
         return auth;
     }
 
+    public boolean checkAuthkey(String auth) {
+        try {
+            QueryBuilder builder = new QueryBuilder(ApiMethods.check_authkey);
+            builder.put("auth", auth);
+            Success succ = invokeAndReturn(builder, Success.class);
+            return succ.isSuccess();
+        } catch(Exception e) {
+            return false;
+        }
+    }
+
     public boolean logout(String auth) throws IOException, ApiException {
         QueryBuilder builder = new QueryBuilder(ApiMethods.logout);
         builder.put("auth", auth);
+        builder.put("mod", true);
         Success succ = invokeAndReturn(builder, Success.class);
         return succ.isSuccess();
     }
diff --git a/src/main/java/eu/crushedpixel/replaymod/api/client/ApiMethods.java b/src/main/java/eu/crushedpixel/replaymod/api/client/ApiMethods.java
index b22bd7c1..ea917ee7 100755
--- a/src/main/java/eu/crushedpixel/replaymod/api/client/ApiMethods.java
+++ b/src/main/java/eu/crushedpixel/replaymod/api/client/ApiMethods.java
@@ -3,6 +3,7 @@ package eu.crushedpixel.replaymod.api.client;
 public class ApiMethods {
 
     public static final String register = "register";
+    public static final String check_authkey = "check_authkey";
     public static final String login = "login";
     public static final String logout = "logout";
     public static final String replay_files = "replay_files";
diff --git a/src/main/java/eu/crushedpixel/replaymod/api/client/holders/ApiError.java b/src/main/java/eu/crushedpixel/replaymod/api/client/holders/ApiError.java
index 18e61333..464e9dd4 100755
--- a/src/main/java/eu/crushedpixel/replaymod/api/client/holders/ApiError.java
+++ b/src/main/java/eu/crushedpixel/replaymod/api/client/holders/ApiError.java
@@ -31,6 +31,6 @@ public class ApiError {
     }
 
     public String getTranslatedDesc() {
-        return I18n.format(key, objects);
+        return I18n.format(key, (Object[])objects);
     }
 }
diff --git a/src/main/java/eu/crushedpixel/replaymod/events/GuiEventHandler.java b/src/main/java/eu/crushedpixel/replaymod/events/GuiEventHandler.java
index d88fe160..3cd623cd 100755
--- a/src/main/java/eu/crushedpixel/replaymod/events/GuiEventHandler.java
+++ b/src/main/java/eu/crushedpixel/replaymod/events/GuiEventHandler.java
@@ -65,8 +65,10 @@ public class GuiEventHandler {
         if(event.gui instanceof GuiMainMenu) {
             if(ReplayMod.firstMainMenu) {
                 ReplayMod.firstMainMenu = false;
-                event.gui = new GuiLoginPrompt(event.gui, event.gui);
-                return;
+                if(!AuthenticationHandler.isAuthenticated()) {
+                    event.gui = new GuiLoginPrompt(event.gui, event.gui);
+                    return;
+                }
             } else {
                 try {
                     MCTimerHandler.setTimerSpeed(1);
diff --git a/src/main/java/eu/crushedpixel/replaymod/online/authentication/AuthenticationHandler.java b/src/main/java/eu/crushedpixel/replaymod/online/authentication/AuthenticationHandler.java
index 7eb343df..b5048933 100755
--- a/src/main/java/eu/crushedpixel/replaymod/online/authentication/AuthenticationHandler.java
+++ b/src/main/java/eu/crushedpixel/replaymod/online/authentication/AuthenticationHandler.java
@@ -4,6 +4,7 @@ import eu.crushedpixel.replaymod.ReplayMod;
 import eu.crushedpixel.replaymod.api.client.ApiClient;
 import eu.crushedpixel.replaymod.api.client.ApiException;
 import eu.crushedpixel.replaymod.api.client.holders.AuthKey;
+import net.minecraftforge.common.config.Property;
 
 import java.io.IOException;
 
@@ -32,12 +33,33 @@ public class AuthenticationHandler {
     public static void register(String username, String mail, String password) throws IOException, ApiException {
         AuthKey auth = apiClient.register(username, mail, password);
         authkey = auth.getAuthkey();
+        saveAuthkey(authkey);
     }
 
+    public static boolean loadAuthkeyFromConfig() {
+        Property p = ReplayMod.instance.config.get("authkey", "authkey", "null");
+
+        String key = null;
+        if(!(p.getString().equals("null"))) {
+            key = p.getString();
+        }
+
+        if(key != null) {
+            boolean succ = apiClient.checkAuthkey(key);
+            if(succ) {
+                authkey = key;
+            } else {
+                saveAuthkey("null");
+            }
+            return succ;
+        }
+        return false;
+    }
 
     public static int authenticate(String username, String password) {
         try {
             authkey = ReplayMod.apiClient.getLogin(username, password).getAuthkey();
+            saveAuthkey(authkey);
             return SUCCESS;
         } catch(ApiException e) {
             return INVALID;
@@ -50,6 +72,7 @@ public class AuthenticationHandler {
         try {
             ReplayMod.apiClient.logout(authkey);
             authkey = null;
+            saveAuthkey("null");
             return SUCCESS;
         } catch(ApiException e) {
             return INVALID;
@@ -57,4 +80,10 @@ public class AuthenticationHandler {
             return NO_CONNECTION;
         }
     }
+
+    private static void saveAuthkey(String authkey) {
+        ReplayMod.instance.config.removeCategory(ReplayMod.config.getCategory("authkey"));
+        ReplayMod.instance.config.get("authkey", "authkey", authkey);
+        ReplayMod.instance.config.save();
+    }
 }
diff --git a/src/main/java/eu/crushedpixel/replaymod/settings/ReplaySettings.java b/src/main/java/eu/crushedpixel/replaymod/settings/ReplaySettings.java
index 37daa94d..62398404 100755
--- a/src/main/java/eu/crushedpixel/replaymod/settings/ReplaySettings.java
+++ b/src/main/java/eu/crushedpixel/replaymod/settings/ReplaySettings.java
@@ -18,8 +18,12 @@ public class ReplaySettings {
         return enums;
     }
 
+    private static final String[] CATEGORIES = new String[]{"recording", "replay", "render", "advanced"};
+
     public void readValues() {
-        Configuration config = ReplayMod.config;
+        Configuration config = ReplayMod.instance.config;
+
+        config.load();
 
         for(RecordingOptions o : RecordingOptions.values()) {
             Property p = getConfigSetting(config, o.name(), o.getValue(), "recording", false);
@@ -146,7 +150,7 @@ public class ReplaySettings {
     public void rewriteSettings() {
         ReplayMod.instance.config.load();
 
-        for(String cat : ReplayMod.instance.config.getCategoryNames()) {
+        for(String cat : CATEGORIES) {
             ReplayMod.instance.config.removeCategory(ReplayMod.instance.config.getCategory(cat));
         }