diff --git a/rtgui/editorpanel.cc b/rtgui/editorpanel.cc
index c94ac2be5..a3915b297 100644
--- a/rtgui/editorpanel.cc
+++ b/rtgui/editorpanel.cc
@@ -18,7 +18,7 @@
  */
 #include <editorpanel.h>
 #include <options.h>
-#include <progressdialog.h>
+#include <progressconnector.h>
 #include <rtwindow.h>
 #include <guiutils.h>
 #include <procparamchangers.h>
@@ -514,11 +514,9 @@ bool EditorPanel::idle_saveImage (ProgressConnector<rtengine::IImage16*> *pc, Gl
 	if( img )
 	   saveImage( img, fname, sf, findNewNameIfNeeded);
 	else{
-		gdk_threads_enter ();
 		Glib::ustring msg_ = Glib::ustring("<b>") + fname + ": Error during image processing\n</b>";
 		Gtk::MessageDialog msgd (*parent, msg_, true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
 		msgd.run ();
-		gdk_threads_leave ();
 
         saveimgas->set_sensitive(true);
         sendtogimp->set_sensitive(true);
@@ -575,11 +573,9 @@ bool EditorPanel::idle_imageSaved(ProgressConnector<int> *pc,rtengine::IImage16*
 			pparams.save (removeExtension (fname) + ".out.pp2");
 		}
 	}else{
-		gdk_threads_enter ();
 		Glib::ustring msg_ = Glib::ustring("<b>") + fname + ": Error during image saving\n</b>";
 		Gtk::MessageDialog msgd (*parent, msg_, true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
 		msgd.run ();
-		gdk_threads_leave ();
     }
     saveimgas->set_sensitive(true);
     sendtogimp->set_sensitive(true);
@@ -687,11 +683,9 @@ bool EditorPanel::idle_sendToGimp( ProgressConnector<rtengine::IImage16*> *pc){
        	ld->startFunc (sigc::bind(sigc::mem_fun(img, &rtengine::IImage16::saveAsTIFF), fileName, sf.tiffBits, sf.tiffUncompressed),
         			   sigc::bind(sigc::mem_fun(*this,&EditorPanel::idle_sentToGimp), ld, img, fileName));
     }else{
-				gdk_threads_enter();
 				Glib::ustring msg_ = Glib::ustring("<b> Error during image processing\n</b>");
 				Gtk::MessageDialog msgd (*parent, msg_, true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
 				msgd.run ();
-				gdk_threads_leave ();
         saveimgas->set_sensitive(true);
         sendtogimp->set_sensitive(true);
     }
@@ -752,13 +746,11 @@ bool EditorPanel::idle_sentToGimp(ProgressConnector<int> *pc,rtengine::IImage16*
 						}
 
 						if (!success) {
-							    gdk_threads_enter ();
 								Gtk::MessageDialog* msgd = new Gtk::MessageDialog (*parent, M("MAIN_MSG_CANNOTSTARTEDITOR"), false, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
 								msgd->set_secondary_text (M("MAIN_MSG_CANNOTSTARTEDITOR_SECONDARY"));
 								msgd->set_title (M("MAIN_BUTTON_SENDTOEDITOR"));
 								msgd->run ();
 								delete msgd;
-								gdk_threads_leave ();
 						}
 
     }
diff --git a/rtgui/editorpanel.h b/rtgui/editorpanel.h
index 2e2a1e992..47079fa4f 100644
--- a/rtgui/editorpanel.h
+++ b/rtgui/editorpanel.h
@@ -31,7 +31,7 @@
 #include <batchqueueentry.h>
 #include <thumbnaillistener.h>
 #include <navigator.h>
-#include <progressdialog.h>
+#include <progressconnector.h>
 
 class EditorPanel;
 struct EditorPanelIdleHelper {
diff --git a/rtgui/filepanel.cc b/rtgui/filepanel.cc
index 47ba5d2f8..ecbb5bb11 100644
--- a/rtgui/filepanel.cc
+++ b/rtgui/filepanel.cc
@@ -151,11 +151,9 @@ bool FilePanel::imageLoaded( Thumbnail* thm, ProgressConnector<rtengine::Initial
 		parent->addEditorPanel (epanel,Glib::path_get_basename (thm->getFileName()));
 		epanel->open(thm, pc->returnValue() );
 	}else {
-		gdk_threads_enter ();
 		Glib::ustring msg_ = Glib::ustring("<b>") + M("MAIN_MSG_CANNOTLOAD") + " \"" + thm->getFileName() + "\" .\n</b>";
 		Gtk::MessageDialog msgd (msg_, true, Gtk::MESSAGE_ERROR, Gtk::BUTTONS_OK, true);
 		msgd.run ();
-		gdk_threads_leave ();
 	}
 	delete pc;
 
diff --git a/rtgui/filepanel.h b/rtgui/filepanel.h
index 86fa47d17..3e0b30e93 100644
--- a/rtgui/filepanel.h
+++ b/rtgui/filepanel.h
@@ -29,7 +29,7 @@
 #include <pparamschangelistener.h>
 #include <history.h>
 #include <filterpanel.h>
-#include <progressdialog.h>
+#include <progressconnector.h>
 
 class RTWindow;
 class FilePanel : public Gtk::HPaned,
diff --git a/rtgui/progressdialog.h b/rtgui/progressconnector.h
similarity index 85%
rename from rtgui/progressdialog.h
rename to rtgui/progressconnector.h
index e43a7137d..f69cba4b6 100644
--- a/rtgui/progressdialog.h
+++ b/rtgui/progressconnector.h
@@ -16,8 +16,8 @@
  *  You should have received a copy of the GNU General Public License
  *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef _PROGRESSDIALOG_
-#define _PROGRESSDIALOG_
+#ifndef _PROGRESSCONNECTOR_
+#define _PROGRESSCONNECTOR_
 
 #include <sigc++/sigc++.h>
 #include <gtkmm.h>
@@ -76,17 +76,23 @@ class PLDBridge : public rtengine::ProgressListener {
 template<class T>
 class ProgressConnector {
 
-        sigc::slot0<T> slotStart;
-        sigc::slot0<bool> slotEnd;
+        sigc::signal0<T> opStart;
+        sigc::signal0<bool> opEnd;
         T retval;
         Glib::Thread *workThread;
+
+		static int emitEndSignal (void* data) {
+			gdk_threads_enter ();
+			sigc::signal0<bool>* opEnd = (sigc::signal0<bool>*) data;
+			int r = opEnd->emit ();
+			delete opEnd;
+			gdk_threads_leave ();
+			return r;
+		}
         
         void workingThread () {
-        	sigc::signal0<T> op;
-        	sigc::connection conn= op.connect(slotStart);
-            retval = op.emit ();
-            conn.disconnect();
-            Glib::signal_idle().connect(slotEnd);
+            retval = opStart.emit ();
+            g_idle_add (ProgressConnector<T>::emitEndSignal, new sigc::signal0<bool> (opEnd));
             workThread = 0;
         }
         
@@ -96,8 +102,8 @@ class ProgressConnector {
 
         void startFunc (const sigc::slot0<T>& startHandler, const sigc::slot0<bool>& endHandler ) {
         	if( !workThread ){
-				slotStart = startHandler;
-				slotEnd = endHandler;
+				opStart.connect (startHandler);
+				opEnd.connect (endHandler);
 				workThread = Glib::Thread::create(sigc::mem_fun(*this, &ProgressConnector<T>::workingThread), 0, true, true, Glib::THREAD_PRIORITY_NORMAL);
         	}
         }
diff --git a/rtgui/progressdialog.cc b/rtgui/progressdialog.cc
deleted file mode 100644
index 871e00bcb..000000000
--- a/rtgui/progressdialog.cc
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- *  This file is part of RawTherapee.
- *
- *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
- *
- *  RawTherapee is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- * 
- *  RawTherapee is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
- */
-#include <progressdialog.h>
-
-template<class T>
-ProgressDialog::ProgressDialog (const sigc::slot0<T>& slot) {
-
-    set_deletable (false);
-    operation.connect (slot);
-}
-
-template<class T>
-void ProgressDialog::start () {
-
-    T ret = operation.emit ();
-}
-
-template<class T>
-void ProgressDialog::finish () {
-
-    gtk_threads_enter ();
-    hide ();
-    gtk_threads_leave ();
-}
-
-template<class T>
-void ProgressDialog::setProgress (double p) {
-}
-
-template<class T>
-void ProgressDialog::setProgressStr (Glib::ustring str) {
-}
-
-template<class T>
-void ProgressDialog::setProgressState (int state) {
-}
-
-template<class T>
-void ProgressDialog::error (Glib::ustring descr) {
-}
diff --git a/rtgui/rtwindow.h b/rtgui/rtwindow.h
index fec9fa462..6ec0b1114 100644
--- a/rtgui/rtwindow.h
+++ b/rtgui/rtwindow.h
@@ -24,7 +24,7 @@
 #include <editorpanel.h>
 #include <batchqueuepanel.h>
 #include <set>
-#include <progressdialog.h>
+#include <progressconnector.h>
 
 class RTWindow : public Gtk::Window, public rtengine::ProgressListener{