diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index d7ce7cc08..4d0e989b2 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -29,7 +29,6 @@ import PyQt4
 from PyQt4.QtGui import *
 from PyQt4.QtCore import *
 import PyQt4.QtCore as QtCore
-print PyQt4.QtCore.PYQT_VERSION_STR
 
 from electrum.bitcoin import MIN_RELAY_TX_FEE, is_valid
 from electrum.plugins import run_hook
@@ -856,7 +855,7 @@ class ElectrumWindow(QMainWindow):
 
             self.broadcast_transaction(tx)
 
-        WaitingDialog(self, 'Signing..').start(sign_thread, sign_done)
+        WaitingDialog(self, 'Signing..', sign_thread, sign_done).start()
 
 
 
@@ -878,7 +877,7 @@ class ElectrumWindow(QMainWindow):
             else:
                 QMessageBox.warning(self, _('Error'), msg, _('OK'))
 
-        WaitingDialog(self, 'Broadcasting..').start(broadcast_thread, broadcast_done)
+        WaitingDialog(self, 'Broadcasting..',broadcast_thread, broadcast_done).start()
 
 
 
diff --git a/gui/qt/util.py b/gui/qt/util.py
index 11ddf6fb0..0c8334bc6 100644
--- a/gui/qt/util.py
+++ b/gui/qt/util.py
@@ -6,26 +6,24 @@ import time
 
 import threading
 
-class WaitingDialog(QDialog):
-    def __init__(self, parent, message):
-        QDialog.__init__(self, parent)
-        self.setWindowTitle('Please wait')
+class WaitingDialog(QThread):
+    def __init__(self, parent, message, run_task, on_complete=None):
+        QThread.__init__(self)
+        self.d = QDialog(parent)
+        self.d.setWindowTitle('Please wait')
         l = QLabel(message)
-        vbox = QVBoxLayout(self)
+        vbox = QVBoxLayout(self.d)
         vbox.addWidget(l)
-        self.show()
-
-    def start(self, run_thread, on_complete=None):
-        def my_thread():
-            self.result = run_thread()
-            self.emit(SIGNAL('done'))
-            self.accept()
-
+        self.run_task = run_task
         if on_complete:
-            self.connect(self, SIGNAL('done'), lambda: on_complete(*self.result))
-        
-        threading.Thread(target=my_thread).start()
+            self.d.connect(self.d, SIGNAL('done'), lambda: on_complete(*self.result))
+        self.d.show()
 
+    def run(self):
+        self.result = self.run_task()
+        self.d.emit(SIGNAL('done'))
+        self.d.accept()
+        
 
 
 class Timer(QThread):
@@ -186,5 +184,5 @@ class MyTreeWidget(QTreeWidget):
 
 if __name__ == "__main__":
     app = QApplication([])
-    WaitingDialog(None, 'testing ...').start(lambda: [time.sleep(1)], lambda x: QMessageBox.information(None, 'done', "done", _('OK')))
+    WaitingDialog(None, 'testing ...', lambda: [time.sleep(1)], lambda x: QMessageBox.information(None, 'done', "done", _('OK'))).start()
     app.exec_()