diff --git a/src/client.cpp b/src/client.cpp
index 19c9bfe2..89c4c813 100755
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -188,7 +188,19 @@ void CClient::run()
 #endif
 
     // init object
-    Init();
+    try
+    {
+        Init();
+    }
+    catch ( CGenErr generr )
+    {
+        // TODO better error management -> should be catched in main thread
+        // problem: how to catch errors in a different thread...?
+
+        // quick hack solution
+        QMessageBox::critical ( 0, APP_NAME, generr.strError, "Quit", 0 );
+        exit ( 0 );
+    }
 
 
     // runtime phase ------------------------------------------------------------
diff --git a/src/client.h b/src/client.h
index abbf6c65..863eb095 100755
--- a/src/client.h
+++ b/src/client.h
@@ -30,6 +30,7 @@
 #include <qhostinfo.h>
 #include <qstring.h>
 #include <qdatetime.h>
+#include <qmessagebox.h>
 #include "global.h"
 #include "socket.h"
 #include "resample.h"
diff --git a/src/global.h b/src/global.h
index a889b1b0..57d10f2e 100755
--- a/src/global.h
+++ b/src/global.h
@@ -133,6 +133,7 @@ typedef unsigned int                    _MESSAGE_IDENT;
 #define MS_JIT_BUF_GET                  4
 #define MS_PACKET_RECEIVED              5
 #define MS_PROTOCOL                     6
+#define MS_ERROR_IN_THREAD              7
 
 #define MUL_COL_LED_RED                 0
 #define MUL_COL_LED_YELLOW              1
diff --git a/windows/sound.cpp b/windows/sound.cpp
index 6ae4bfd0..0f3ffc42 100755
--- a/windows/sound.cpp
+++ b/windows/sound.cpp
@@ -60,15 +60,18 @@ HANDLE           m_ASIOEvent;
 int              iInCurBlockToWrite;
 short*           psSoundcardBuffer[MAX_SND_BUF_IN];
 bool             bBufferOverrun;
-short*           psCaptureConvBuf;
-int              iCurPosCaptConvBuf;
 
 // wave out
 int              iOutCurBlockToWrite;
 short*           psPlaybackBuffer[MAX_SND_BUF_OUT];
 bool             bBufferUnderrun;
+
+// ASIO buffer size conversion buffer
+short*           psCaptureConvBuf;
+int              iCurPosCaptConvBuf;
 short*           psPlayConvBuf;
 int              iCurPosPlayConvBuf;
+int              iASIOConfBufSize;
 
 int              iCurNumSndBufIn;
 int              iCurNumSndBufOut;
@@ -313,7 +316,8 @@ void CSound::InitRecordingAndPlayback ( int iNewBufferSize )
  // TEST test if requested buffer size is supported by the audio hardware, if not, fire error
 if ( iASIOBufferSizeMono != iBufferSizeMono )
 {
-    throw CGenErr ( "Required sound card buffer size not allowed by the audio hardware." );
+    throw CGenErr ( QString ( "Required sound card buffer size of %1 samples "
+        "not supported by the audio hardware." ).arg(iBufferSizeMono) );
 }
 
         // prepare input channels
@@ -397,12 +401,15 @@ if ( iASIOBufferSizeMono != iBufferSizeMono )
         // create memory for ASIO buffer conversion if required
         if ( iASIOBufferSizeMono != iBufferSizeMono )
         {
+            // required size: two times of one stereo buffer of the larger buffer
+            iASIOConfBufSize = max(4 * iASIOBufferSizeMono, 2 * iBufferSizeStereo);
+
             if ( psCaptureConvBuf != NULL )
 	        {
                 delete[] psCaptureConvBuf;
 	        }
 
-            psCaptureConvBuf   = new short[max(2 * iASIOBufferSizeMono, iBufferSizeStereo)];
+            psCaptureConvBuf   = new short[iASIOConfBufSize];
             iCurPosCaptConvBuf = 0;
 
             if ( psPlayConvBuf != NULL )
@@ -410,7 +417,7 @@ if ( iASIOBufferSizeMono != iBufferSizeMono )
                 delete[] psPlayConvBuf;
 	        }
 
-            psPlayConvBuf      = new short[max(2 * iASIOBufferSizeMono, iBufferSizeStereo)];
+            psPlayConvBuf      = new short[iASIOConfBufSize];
             iCurPosPlayConvBuf = 0;
         }