diff --git a/CHANGES b/CHANGES
index fdae0471..bb165554 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,15 @@
+4.1.9.3 2020-03-31
+- Set default method to chacha20-ietf-poly1305
+- Using hash in PAC URL (#2759)
+- Rename and translate title of statistics form (#2768)
+- Russian translation (#2767)
+- Refine Updated Notification logic
+- Using NLog (#2783)
+- Bug fix: wrong server in tray menu (#2782)
+- Deprecate unsafe encryption method (#2757, #2801)
+- Bug fix: server config is overwritten by others when moving up/down (#2830)
+- Other minor bug fixes and improvements
+
 4.1.9.2 2019-12-25
 - Fix i18n issues (#2740, #2741)
 
diff --git a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
index fb1aa331..bfbc460e 100644
--- a/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
+++ b/shadowsocks-csharp/Controller/Service/UpdateChecker.cs
@@ -26,7 +26,7 @@ namespace Shadowsocks.Controller
         public string LatestVersionLocalName;
         public event EventHandler CheckUpdateCompleted;
 
-        public const string Version = "4.1.9.2";
+        public const string Version = "4.1.9.3";
 
         private class CheckUpdateTimer : System.Timers.Timer
         {
diff --git a/shadowsocks-csharp/Data/i18n.csv b/shadowsocks-csharp/Data/i18n.csv
index f2bf8a29..3b50567f 100644
--- a/shadowsocks-csharp/Data/i18n.csv
+++ b/shadowsocks-csharp/Data/i18n.csv
@@ -76,6 +76,7 @@ New server,Новый сервер,未配置的服务器,新伺服器,新規サ
 Move &Up,Выше,上移(&U),上移 (&U),上に移動 (&U)
 Move D&own,Ниже,下移(&O),下移 (&O),下に移動 (&O)
 deprecated,Устаревшее,不推荐,不推薦,非推奨
+"Encryption method {0} not exist, will replace with {1}",,"加密方法{0}不存在，将使用{1}代替",,
 ,,,,
 #Statistics Config,,,,
 ,,,,
diff --git a/shadowsocks-csharp/View/ConfigForm.cs b/shadowsocks-csharp/View/ConfigForm.cs
index caab2f6d..aa337e6e 100755
--- a/shadowsocks-csharp/View/ConfigForm.cs
+++ b/shadowsocks-csharp/View/ConfigForm.cs
@@ -79,7 +79,14 @@ namespace Shadowsocks.View
             public static EncryptionMethod GetMethod(string name)
             {
                 if (!init) Init();
-                return methodByName[name];
+                bool success = methodByName.TryGetValue(name, out EncryptionMethod method);
+                if (!success)
+                {
+                    string defaultMethod = Server.DefaultMethod;
+                    MessageBox.Show(I18N.GetString("Encryption method {0} not exist, will replace with {1}", name, defaultMethod), I18N.GetString("Shadowsocks"));
+                    return methodByName[defaultMethod];
+                }
+                return method;
             }
 
             private EncryptionMethod(string name, bool deprecated)
@@ -568,21 +575,18 @@ namespace Shadowsocks.View
 
         private void MoveConfigItem(int step)
         {
-            int index = ServersListBox.SelectedIndex;
-            Server server = _modifiedConfiguration.configs[index];
-            object item = ServersListBox.Items[index];
+            var server = _modifiedConfiguration.configs[_lastSelectedIndex];
+            var newIndex = _lastSelectedIndex + step;
 
-            _modifiedConfiguration.configs.Remove(server);
-            _modifiedConfiguration.configs.Insert(index + step, server);
-            _modifiedConfiguration.index += step;
+            _modifiedConfiguration.configs.RemoveAt(_lastSelectedIndex);
+            _modifiedConfiguration.configs.Insert(newIndex, server);
 
             ServersListBox.BeginUpdate();
-            ServersListBox.Enabled = false;
-            _lastSelectedIndex = index + step;
-            ServersListBox.Items.Remove(item);
-            ServersListBox.Items.Insert(index + step, item);
-            ServersListBox.Enabled = true;
-            ServersListBox.SelectedIndex = index + step;
+
+            LoadServerNameListToUI(_modifiedConfiguration);
+
+            _lastSelectedIndex = newIndex;
+            ServersListBox.SelectedIndex = newIndex;
             ServersListBox.EndUpdate();
 
             UpdateButtons();