diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 32c52531e4..d059a69ada 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,19 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2012-06-02 15:43 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
+  * contrib/hbqt/qtcore/qth/QChildEvent.qth
+  * contrib/hbqt/qtcore/qth/QEvent.qth
+  * contrib/hbqt/qtcore/qth/QLatin1Char.qth
+  * contrib/hbqt/qtcore/qth/QLatin1String.qth
+  * contrib/hbqt/qtcore/qth/QMimeData.qth
+  * contrib/hbqt/qtcore/qth/QObject.qth
+  * contrib/hbqt/qtcore/qth/QTextDecoder.qth
+  * contrib/hbqt/qtcore/qth/QTextEncoder.qth
+  * contrib/hbqt/qtcore/qth/QThread.qth
+  * contrib/hbqt/qtcore/qth/QTranslator.qth
+    ! Fixed: constructors.
+
 2012-06-02 14:40 UTC-0800 Pritpal Bedi (bedipritpal@hotmail.com)
   * contrib/hbqt/qtgui/qth/QCalendarWidget.qth
   * contrib/hbqt/qtgui/qth/QCheckBox.qth
diff --git a/harbour/contrib/hbqt/qtcore/qth/QChildEvent.qth b/harbour/contrib/hbqt/qtcore/qth/QChildEvent.qth
index dd2cee3329..815c625ebb 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QChildEvent.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QChildEvent.qth
@@ -31,6 +31,10 @@ HB_FUNC( QT_QCHILDEVENT )
    {
       __HB_RETPTRGC__( new QChildEvent( ( QEvent::Type ) hb_parni( 1 ), hbqt_par_QObject( 2 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QEvent.qth b/harbour/contrib/hbqt/qtcore/qth/QEvent.qth
index 25dd2e7558..df0ad63148 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QEvent.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QEvent.qth
@@ -35,6 +35,10 @@ HB_FUNC( QT_QEVENT )
    {
       __HB_RETPTRGC__( new QEvent( ( QEvent::Type ) hb_parni( 1 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QLatin1Char.qth b/harbour/contrib/hbqt/qtcore/qth/QLatin1Char.qth
index b46a747d95..6991ecb6d3 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QLatin1Char.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QLatin1Char.qth
@@ -39,6 +39,10 @@ HB_FUNC( QT_QLATIN1CHAR )
    {
       __HB_RETPTRGC__( new QLatin1Char( ( char ) hb_parni( 1 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QLatin1String.qth b/harbour/contrib/hbqt/qtcore/qth/QLatin1String.qth
index adc185c687..9373250931 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QLatin1String.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QLatin1String.qth
@@ -35,6 +35,10 @@ HB_FUNC( QT_QLATIN1STRING )
    {
       __HB_RETPTRGC__( new QLatin1String( hb_parcx( 1 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QMimeData.qth b/harbour/contrib/hbqt/qtcore/qth/QMimeData.qth
index 66f36a937d..2ef9462da9 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QMimeData.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QMimeData.qth
@@ -29,10 +29,7 @@ Destructor  =
  */
 HB_FUNC( QT_QMIMEDATA )
 {
-   if( hb_pcount() == 0 )
-   {
-      __HB_RETPTRGC__( new QMimeData() );
-   }
+   __HB_RETPTRGC__( new QMimeData() );
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QObject.qth b/harbour/contrib/hbqt/qtcore/qth/QObject.qth
index 102c567d51..ee45297c1a 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QObject.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QObject.qth
@@ -32,7 +32,7 @@ HB_FUNC( QT_QOBJECT )
    }
    else
    {
-      __HB_RETPTRGC__( new QObject( 0 ) );
+      __HB_RETPTRGC__( new QObject() );
    }
 }
 </CODE>
diff --git a/harbour/contrib/hbqt/qtcore/qth/QTextDecoder.qth b/harbour/contrib/hbqt/qtcore/qth/QTextDecoder.qth
index 95aa5dc757..16d831ae70 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QTextDecoder.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QTextDecoder.qth
@@ -32,6 +32,10 @@ HB_FUNC( QT_QTEXTDECODER )
    {
       __HB_RETPTRGC__( new QTextDecoder( hbqt_par_QTextCodec( 1 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QTextEncoder.qth b/harbour/contrib/hbqt/qtcore/qth/QTextEncoder.qth
index 0eb64b05fc..da04e5f826 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QTextEncoder.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QTextEncoder.qth
@@ -32,6 +32,10 @@ HB_FUNC( QT_QTEXTENCODER )
    {
       __HB_RETPTRGC__( new QTextEncoder( hbqt_par_QTextCodec( 1 ) ) );
    }
+   else
+   {
+      hb_errRT_BASE( EG_ARG, 9999, NULL, HB_ERR_FUNCNAME, HB_ERR_ARGS_BASEPARAMS );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QThread.qth b/harbour/contrib/hbqt/qtcore/qth/QThread.qth
index 60f338b70e..06522a31e0 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QThread.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QThread.qth
@@ -28,7 +28,14 @@ Destructor  =
  */
 HB_FUNC( QT_QTHREAD )
 {
-   __HB_RETPTRGC__( new QThread() );
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QOBJECT" ) )
+   {
+      __HB_RETPTRGC__( new QThread( hbqt_par_QObject( 1 ) ) );
+   }
+   else
+   {
+      __HB_RETPTRGC__( new QThread() );
+   }      
 }
 </CODE>
 
diff --git a/harbour/contrib/hbqt/qtcore/qth/QTranslator.qth b/harbour/contrib/hbqt/qtcore/qth/QTranslator.qth
index 0cd8479be5..7843147259 100644
--- a/harbour/contrib/hbqt/qtcore/qth/QTranslator.qth
+++ b/harbour/contrib/hbqt/qtcore/qth/QTranslator.qth
@@ -28,9 +28,9 @@ Destructor  =
  */
 HB_FUNC( QT_QTRANSLATOR )
 {
-   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QTRANSLATOR" ) )
+   if( hb_pcount() == 1 && hbqt_par_isDerivedFrom( 1, "QOBJECT" ) )
    {
-      __HB_RETPTRGC__( new QTranslator( hbqt_par_QTranslator( 1 ) ) );
+      __HB_RETPTRGC__( new QTranslator( hbqt_par_QObject( 1 ) ) );
    }
    else
    {