diff --git a/ChanSort.Loader.Panasonic/Serializer.cs b/ChanSort.Loader.Panasonic/Serializer.cs
index db02d2f..1237a8e 100644
--- a/ChanSort.Loader.Panasonic/Serializer.cs
+++ b/ChanSort.Loader.Panasonic/Serializer.cs
@@ -531,7 +531,7 @@ order by s.ntype,major_channel
       cmd.Parameters.Add(new SQLiteParameter("@lock", DbType.Int32));
       cmd.Parameters.Add(new SQLiteParameter("@skip", DbType.Int32));
       cmd.Prepare();
-      foreach (DbChannel channel in channelList.Channels)
+      foreach (ChannelInfo channel in channelList.Channels)
       {
         if (channel.NewProgramNr < 0)
           continue;
@@ -550,7 +550,7 @@ order by s.ntype,major_channel
       cmd.CommandText = "delete from SVL where rowid=@rowid";
       cmd.Parameters.Clear();
       cmd.Parameters.Add(new SQLiteParameter("@rowid", DbType.Int32));
-      foreach (DbChannel channel in channelList.Channels)
+      foreach (ChannelInfo channel in channelList.Channels)
       {
         if (channel.NewProgramNr >= 0)
           continue;
diff --git a/ChanSort/MainForm.cs b/ChanSort/MainForm.cs
index 06bb0ec..7d03fcd 100644
--- a/ChanSort/MainForm.cs
+++ b/ChanSort/MainForm.cs
@@ -24,7 +24,7 @@ namespace ChanSort.Ui
 {
   public partial class MainForm : XtraForm
   {
-    public const string AppVersion = "v2013-06-27";
+    public const string AppVersion = "v2013-06-28";
 
     private const int MaxMruEntries = 5;
 
@@ -1761,6 +1761,8 @@ namespace ChanSort.Ui
         var view = (GridView)sender;
         if (this.downHit == null || downHit.RowHandle < 0 || e.Button != MouseButtons.Left || view.ActiveEditor != null || ModifierKeys != Keys.None)
           return;
+        if (this.currentChannelList == null || this.currentChannelList.ReadOnly)
+          return;
         // drag/drop only allowed when left grid is sorted by NewSlotNr
         if (!this.IsLeftGridSortedByNewProgNr) 
           return;
diff --git a/readme.txt b/readme.txt
index 1785e94..a49c816 100644
--- a/readme.txt
+++ b/readme.txt
@@ -1,6 +1,7 @@
-Version v2013-06-27 ======================================================
+Version v2013-06-28 ======================================================
 
 Changes:
+- FIX: Error saving a Panasonic file after applying a reference list
 - Improved experimental support for Panasonic channel lists
 
 The complete change log can be found at the end of this document