diff --git a/DVMConsole/MainWindow.xaml.cs b/DVMConsole/MainWindow.xaml.cs
index 0c212e4..09ae7ee 100644
--- a/DVMConsole/MainWindow.xaml.cs
+++ b/DVMConsole/MainWindow.xaml.cs
@@ -1572,7 +1572,7 @@ namespace dvmconsole
 
                     PeerSystem handler = fneSystemManager.GetFneSystem(system.Name);
 
-                    if (!channel.IsEnabled)
+                    if (!channel.IsEnabled || channel.Name == PLAYBACKCHNAME)
                         continue;
 
                     if (cpgChannel.Tgid != e.DstId.ToString())
diff --git a/DVMConsole/P25Crypto.cs b/DVMConsole/P25Crypto.cs
index c1b7b1f..f539008 100644
--- a/DVMConsole/P25Crypto.cs
+++ b/DVMConsole/P25Crypto.cs
@@ -307,8 +307,11 @@ namespace dvmconsole
         private bool ARC4Process(byte[] imbe, P25DUID duid)
         {
             int offset = 256;
-            if (duid != P25DUID.LDU2)
-                offset += 101;
+
+            if (duid == P25DUID.LDU1)
+                offset = 0;
+            else if (duid == P25DUID.LDU2)
+                offset = 101;
 
             offset += (ksPosition * IMBE_BUF_LEN) + 267 + (ksPosition < 8 ? 0 : 2);
             ksPosition = (ksPosition + 1) % 9;