diff --git a/src/Umbraco.Web/PropertyEditors/RichTextPreValueController.cs b/src/Umbraco.Web/PropertyEditors/RichTextPreValueController.cs
index 0497dddd8f..9622008a05 100644
--- a/src/Umbraco.Web/PropertyEditors/RichTextPreValueController.cs
+++ b/src/Umbraco.Web/PropertyEditors/RichTextPreValueController.cs
@@ -18,10 +18,11 @@ namespace Umbraco.Web.PropertyEditors
     [PluginController("UmbracoApi")]
     public class RichTextPreValueController : UmbracoAuthorizedJsonController
     {
-        private static bool _init = false;
-        private static Dictionary<string, RichTextEditorCommand> _commands = new Dictionary<string,RichTextEditorCommand>();
-        private static Dictionary<string, RichTextEditorPlugin> _plugins = new Dictionary<string, RichTextEditorPlugin>();
-        private static Dictionary<string, string> _configOptions = new Dictionary<string, string>();
+        private static volatile bool _init = false;
+        private static readonly object Locker = new object();
+        private static readonly Dictionary<string, RichTextEditorCommand> Commands = new Dictionary<string,RichTextEditorCommand>();
+        private static readonly Dictionary<string, RichTextEditorPlugin> Plugins = new Dictionary<string, RichTextEditorPlugin>();
+        private static readonly Dictionary<string, string> ConfigOptions = new Dictionary<string, string>();
        
         private static string _invalidElements = "";
         private static string _validElements = "";
@@ -29,98 +30,109 @@ namespace Umbraco.Web.PropertyEditors
 
         public RichTextEditorConfiguration GetConfiguration()
         {
-            if (!_init)
-                init();
-
+            EnsureInit();
 
             RichTextEditorConfiguration config = new RichTextEditorConfiguration();
-            config.Plugins = _plugins.Values;
-            config.Commands = _commands.Values;
+            config.Plugins = Plugins.Values;
+            config.Commands = Commands.Values;
             config.ValidElements = _validElements;
             config.InvalidElements = _invalidElements;
-            config.CustomConfig = _configOptions;
+            config.CustomConfig = ConfigOptions;
 
             return config;
         }
 
 
 
-        private static void init()
+        private static void EnsureInit()
         {
-            // Load config
-            XmlDocument xd = new XmlDocument();
-            xd.Load(IOHelper.MapPath(SystemFiles.TinyMceConfig));
 
-            foreach (XmlNode n in xd.DocumentElement.SelectNodes("//command"))
-            {   
-                var alias = n.SelectSingleNode("./umbracoAlias").FirstChild.Value.ToLower();
-
-                bool isStyle = false;
-                if (n.Attributes.GetNamedItem("isStyle") != null)
-                    isStyle = bool.Parse(n.Attributes.GetNamedItem("isStyle").Value);
-                    
-                if(!_commands.ContainsKey(alias))
-                    _commands.Add(
-                             alias,
-                             new RichTextEditorCommand()
-                             {
-                                 IsStylePicker = isStyle,
-                                 Icon = n.SelectSingleNode("./icon").FirstChild.Value,
-                                 Command = n.SelectSingleNode("./tinyMceCommand").FirstChild.Value,
-                                 Alias = n.SelectSingleNode("./umbracoAlias").FirstChild.Value.ToLower(),
-                                 UserInterface = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("userInterface").Value,
-                                 FrontEndCommand = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("frontendCommand").Value,
-                                 Value = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("value").Value,
-                                 Priority = int.Parse(n.SelectSingleNode("./priority").FirstChild.Value)
-                             }
-                       );
-            }
-
-
-            foreach (XmlNode n in xd.DocumentElement.SelectNodes("//plugin"))
+            if (_init == false)
             {
-                if (!_plugins.ContainsKey(n.FirstChild.Value))
+                lock (Locker)
                 {
-                    bool useOnFrontend = false;
-                    if (n.Attributes.GetNamedItem("loadOnFrontend") != null)
-                        useOnFrontend = bool.Parse(n.Attributes.GetNamedItem("loadOnFrontend").Value);
+                    if (_init == false)
+                    {
+                        // Load config
+                        XmlDocument xd = new XmlDocument();
+                        xd.Load(IOHelper.MapPath(SystemFiles.TinyMceConfig));
 
-                    _plugins.Add(
-                        n.FirstChild.Value.ToLower(),
-                        new RichTextEditorPlugin(){
-                            Name = n.FirstChild.Value,
-                            UseOnFrontend = useOnFrontend});
+                        foreach (XmlNode n in xd.DocumentElement.SelectNodes("//command"))
+                        {
+                            var alias = n.SelectSingleNode("./umbracoAlias").FirstChild.Value.ToLower();
+
+                            bool isStyle = false;
+                            if (n.Attributes.GetNamedItem("isStyle") != null)
+                                isStyle = bool.Parse(n.Attributes.GetNamedItem("isStyle").Value);
+
+                            if (!Commands.ContainsKey(alias))
+                                Commands.Add(
+                                         alias,
+                                         new RichTextEditorCommand()
+                                         {
+                                             IsStylePicker = isStyle,
+                                             Icon = n.SelectSingleNode("./icon").FirstChild.Value,
+                                             Command = n.SelectSingleNode("./tinyMceCommand").FirstChild.Value,
+                                             Alias = n.SelectSingleNode("./umbracoAlias").FirstChild.Value.ToLower(),
+                                             UserInterface = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("userInterface").Value,
+                                             FrontEndCommand = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("frontendCommand").Value,
+                                             Value = n.SelectSingleNode("./tinyMceCommand").Attributes.GetNamedItem("value").Value,
+                                             Priority = int.Parse(n.SelectSingleNode("./priority").FirstChild.Value)
+                                         }
+                                   );
+                        }
+
+
+                        foreach (XmlNode n in xd.DocumentElement.SelectNodes("//plugin"))
+                        {
+                            if (!Plugins.ContainsKey(n.FirstChild.Value))
+                            {
+                                bool useOnFrontend = false;
+                                if (n.Attributes.GetNamedItem("loadOnFrontend") != null)
+                                    useOnFrontend = bool.Parse(n.Attributes.GetNamedItem("loadOnFrontend").Value);
+
+                                Plugins.Add(
+                                    n.FirstChild.Value.ToLower(),
+                                    new RichTextEditorPlugin()
+                                    {
+                                        Name = n.FirstChild.Value,
+                                        UseOnFrontend = useOnFrontend
+                                    });
+                            }
+                        }
+
+
+                        foreach (XmlNode n in xd.DocumentElement.SelectNodes("//config"))
+                        {
+                            if (!ConfigOptions.ContainsKey(n.Attributes["key"].FirstChild.Value))
+                            {
+                                var value = "";
+                                if (n.FirstChild != null)
+                                    value = n.FirstChild.Value;
+
+                                ConfigOptions.Add(
+                                    n.Attributes["key"].FirstChild.Value.ToLower(),
+                                    value);
+                            }
+                        }
+
+                        if (xd.DocumentElement.SelectSingleNode("./invalidElements") != null)
+                            _invalidElements = xd.DocumentElement.SelectSingleNode("./invalidElements").FirstChild.Value;
+                        if (xd.DocumentElement.SelectSingleNode("./validElements") != null)
+                        {
+                            string _val = xd.DocumentElement.SelectSingleNode("./validElements").FirstChild.Value.Replace("\r", "").Replace("\n", "");
+                            _validElements = _val;
+
+                            /*foreach (string s in _val.Split("\n".ToCharArray()))
+                                _validElements += "'" + s + "' + \n";
+                            _validElements = _validElements.Substring(0, _validElements.Length - 4);*/
+                        }
+
+                        _init = true;
+                    }
                 }
             }
-
-
-            foreach (XmlNode n in xd.DocumentElement.SelectNodes("//config"))
-            {
-                if (!_configOptions.ContainsKey(n.Attributes["key"].FirstChild.Value))
-                {
-                    var value = "";
-                    if (n.FirstChild != null)
-                        value = n.FirstChild.Value;
-
-                    _configOptions.Add(
-                        n.Attributes["key"].FirstChild.Value.ToLower(),
-                        value);
-                }
-            }
-
-            if (xd.DocumentElement.SelectSingleNode("./invalidElements") != null)
-                _invalidElements = xd.DocumentElement.SelectSingleNode("./invalidElements").FirstChild.Value;
-            if (xd.DocumentElement.SelectSingleNode("./validElements") != null)
-            {
-                string _val = xd.DocumentElement.SelectSingleNode("./validElements").FirstChild.Value.Replace("\r", "").Replace("\n", "");
-                _validElements = _val;
-
-                /*foreach (string s in _val.Split("\n".ToCharArray()))
-                    _validElements += "'" + s + "' + \n";
-                _validElements = _validElements.Substring(0, _validElements.Length - 4);*/
-            }
-
-            _init = true;
+            
         }
 
     }