diff --git a/Output/Themes/Ambient/Screens/ScreenSong.xml b/Output/Themes/Ambient/Screens/ScreenSong.xml
index 559c0d2d..62dba236 100644
--- a/Output/Themes/Ambient/Screens/ScreenSong.xml
+++ b/Output/Themes/Ambient/Screens/ScreenSong.xml
@@ -1232,7 +1232,7 @@
           <Text />
           </Text>
             </ButtonPlaylistSing>
-      <SelectSlideGameMode>
+      <SelectSlideGameMode Name="SelectSlideGameMode">
         <Skin>Button</Skin>
         <SkinArrowLeft>SelectSlideArrowLeft</SkinArrowLeft>
         <SkinArrowRight>SelectSlideArrowRight</SkinArrowRight>
diff --git a/VocaluxeLib/Menu/CMenu.cs b/VocaluxeLib/Menu/CMenu.cs
index dfc66cce..7bb87d13 100644
--- a/VocaluxeLib/Menu/CMenu.cs
+++ b/VocaluxeLib/Menu/CMenu.cs
@@ -137,6 +137,26 @@ namespace VocaluxeLib.Menu
             }
         }
 
+        private class CLoadThemeErrorHandler : CXmlDeserializer.CXmlDefaultErrorHandler
+        {
+            private static readonly string[] _AllowedMissing = new string[]
+                {
+                    "Backgrounds", "Statics", "Texts", "Buttons", "SongMenus", "Lyrics", "SelectSlides", "SingNotes",
+                    "NameSelections", "Equalizers", "Playlists", "ParticleEffects", "ScreenSettings"
+                };
+
+            public override void HandleError(CXmlException e)
+            {
+                CXmlMissingElementException missingEx = e as CXmlMissingElementException;
+                if (missingEx != null)
+                {
+                    if (_AllowedMissing.Contains(missingEx.Field.Name))
+                        return;
+                }
+                base.HandleError(e);
+            }
+        }
+
         public virtual void LoadTheme(string xmlPath)
         {
             if (CBase.Config.GetLoadOldThemeFiles())
@@ -149,26 +169,10 @@ namespace VocaluxeLib.Menu
 
             string file = Path.Combine(xmlPath, ThemeName + ".xml");
 
-            Theme.Informations = new SScreenInformation();
-            Theme.Backgrounds = new List<SThemeBackground>();
-            Theme.Statics = new List<SThemeStatic>();
-            Theme.Texts = new List<SThemeText>();
-            Theme.Buttons = new List<SThemeButton>();
-            Theme.SongMenus = new List<SThemeSongMenu>();
-            Theme.Lyrics = new List<SThemeLyrics>();
-            Theme.SelectSlides = new List<SThemeSelectSlide>();
-            Theme.SingNotes = new List<SThemeSingBar>();
-            Theme.NameSelections = new List<SThemeNameSelection>();
-            Theme.Equalizers = new List<SThemeEqualizer>();
-            Theme.Playlists = new List<SThemePlaylist>();
-            Theme.ParticleEffects = new List<SThemeParticleEffect>();
-            Theme.ScreenSettings = new List<SThemeScreenSetting>();
-
             try
             {
-                TextReader textReader = new StreamReader(file);
-                XmlSerializer deserializer = new XmlSerializer(typeof(SThemeScreen));
-                Theme = (SThemeScreen)deserializer.Deserialize(textReader);
+                CXmlDeserializer deserializer = new CXmlDeserializer(new CLoadThemeErrorHandler());
+                Theme = deserializer.Deserialize<SThemeScreen>(file);
 
                 foreach (SThemeBackground bg in Theme.Backgrounds)
                     _AddBackground(new CBackground(bg, PartyModeID), bg.Name);
@@ -227,6 +231,10 @@ namespace VocaluxeLib.Menu
             {
                 CBase.Log.LogError("Error while reading " + ThemeName + ".xml", true, true);
             }
+            catch (CXmlException e)
+            {
+                CBase.Log.LogError("Error while reading " + ThemeName + ".xml: " + e, true, true);
+            }
             catch (Exception e)
             {
                 CBase.Log.LogError(e.Message + e.StackTrace, true, true);
@@ -308,12 +316,8 @@ namespace VocaluxeLib.Menu
 
             try
             {
-                TextWriter textWriter = new StreamWriter(Path.Combine(ThemePath, ThemeName + ".xml"));
-
-                XmlSerializer serializer = new XmlSerializer(typeof(SThemeScreen));
-                serializer.Serialize(textWriter, Theme);
-
-                textWriter.Close();
+                CXmlSerializer serializer = new CXmlSerializer();
+                serializer.Serialize(Path.Combine(ThemePath, ThemeName + ".xml"), Theme);
             }
             catch (Exception e)
             {
diff --git a/VocaluxeLib/Menu/CSelectSlide.cs b/VocaluxeLib/Menu/CSelectSlide.cs
index be8a8ad9..64f39b08 100644
--- a/VocaluxeLib/Menu/CSelectSlide.cs
+++ b/VocaluxeLib/Menu/CSelectSlide.cs
@@ -17,6 +17,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Drawing;
 using System.Xml.Serialization;
@@ -52,8 +53,8 @@ namespace VocaluxeLib.Menu
         public SThemeColor TextSelColor;
 
         public float TextH;
-        public float TextRelativeX;
-        public float TextRelativeY;
+        [DefaultValue(0.0f)] public float TextRelativeX;
+        [DefaultValue(0.0f)] public float TextRelativeY;
         public float TextMaxW;
 
         public string TextFont;
diff --git a/VocaluxeLib/Structs.cs b/VocaluxeLib/Structs.cs
index d59163a3..09a1b960 100644
--- a/VocaluxeLib/Structs.cs
+++ b/VocaluxeLib/Structs.cs
@@ -186,6 +186,7 @@ namespace VocaluxeLib
         public float Z;
         [XmlIgnore] public float Rotation; //0..360°
 
+        [XmlIgnore]
         public float Right
         {
             get { return X + W; }
@@ -195,6 +196,8 @@ namespace VocaluxeLib
                 Debug.Assert(W >= 0);
             }
         }
+
+        [XmlIgnore]
         public float Bottom
         {
             get { return Y + H; }
@@ -204,10 +207,14 @@ namespace VocaluxeLib
                 Debug.Assert(H >= 0);
             }
         }
+
+        [XmlIgnore]
         public Size SizeI
         {
             get { return new Size((int)W, (int)H); }
         }
+
+        [XmlIgnore]
         public SizeF Size
         {
             get { return new SizeF(W, H); }
diff --git a/VocaluxeLib/Xml/CXmlDeserializer.cs b/VocaluxeLib/Xml/CXmlDeserializer.cs
index cc51c26f..df8c7879 100644
--- a/VocaluxeLib/Xml/CXmlDeserializer.cs
+++ b/VocaluxeLib/Xml/CXmlDeserializer.cs
@@ -86,14 +86,14 @@ namespace VocaluxeLib.Xml
         }
         #endregion Debug Helpers
 
-        private readonly XmlNode _Node;
+        public readonly XmlNode Node;
         public readonly bool IsError;
 
         public CXmlException(string msg, XmlNode node, bool isError = true)
             : base(msg)
         {
             IsError = isError;
-            _Node = node;
+            Node = node;
         }
 
         public override string Message
@@ -103,12 +103,22 @@ namespace VocaluxeLib.Xml
 
         public override String ToString()
         {
-            string xPath = _Node == null ? "" : _GetXPath(_Node);
+            string xPath = Node == null ? "" : _GetXPath(Node);
             string type = IsError ? "Error" : "Warning";
             return type + ": " + base.Message.Replace("%n", xPath);
         }
     }
 
+    public class CXmlMissingElementException : CXmlException
+    {
+        public readonly SFieldInfo Field;
+
+        public CXmlMissingElementException(XmlNode parent, SFieldInfo field, bool isError = true) : base("Element: " + field.Name + " is missing in %n", parent, isError)
+        {
+            Field = field;
+        }
+    }
+
     public class CXmlInvalidValueException : CXmlException
     {
         private readonly string _Value;
@@ -157,9 +167,9 @@ namespace VocaluxeLib.Xml
 
     public class CXmlDeserializer
     {
-        private class CXmlDefaultErrorHandler : IXmlErrorHandler
+        public class CXmlDefaultErrorHandler : IXmlErrorHandler
         {
-            public void HandleError(CXmlException e)
+            public virtual void HandleError(CXmlException e)
             {
                 if (e.IsError)
                     throw e;
@@ -421,7 +431,7 @@ namespace VocaluxeLib.Xml
                 Dictionary<string, Tuple<SFieldInfo, List<object>>> embLists = new Dictionary<string, Tuple<SFieldInfo, List<object>>>();
                 foreach (XmlNode node in nodes)
                 {
-                    if (node is XmlComment)
+                    if (node is XmlComment || node.LocalName == "xsd" || node.LocalName == "xsi")
                         continue;
 
                     SFieldInfo field = new SFieldInfo();
@@ -505,7 +515,7 @@ namespace VocaluxeLib.Xml
                 if (!_CheckAndSetDefaultValue(o, field))
                 {
                     if (parent != null)
-                        _ErrorHandler.HandleError(new CXmlException("element: " + field.Name + " is missing in %n", parent));
+                        _ErrorHandler.HandleError(new CXmlMissingElementException(parent, field));
                     object value = _GetValue(null, field.Type, field.ArrayItemName, field.GetValue(o));
                     if (value != null)
                         field.SetValue(o, value);