diff --git a/src/urh/controller/MainController.py b/src/urh/controller/MainController.py
index 1a0e81599c..e4b81f5bcd 100644
--- a/src/urh/controller/MainController.py
+++ b/src/urh/controller/MainController.py
@@ -304,7 +304,12 @@ def add_signal(self, signal, group_id=0, index=-1):
 
         self.signal_protocol_dict[sig_frame] = pa
 
-        sig_frame.refresh(draw_full_signal=True)  # protocol is derived here
+        sig_frame.refresh_signal(draw_full_signal=True)
+        sig_frame.refresh_signal_information(block=True)
+
+        qApp.processEvents()
+        sig_frame.show_protocol(refresh=True)
+
         if self.project_manager.read_participants_for_signal(signal, pa.messages):
             sig_frame.ui.gvSignal.redraw_view()
 
diff --git a/src/urh/controller/widgets/SignalFrame.py b/src/urh/controller/widgets/SignalFrame.py
index 4963efba3d..7c87e70e70 100644
--- a/src/urh/controller/widgets/SignalFrame.py
+++ b/src/urh/controller/widgets/SignalFrame.py
@@ -506,6 +506,9 @@ def restore_protocol_selection(self, sel_start, sel_end, start_message, end_mess
 
     def update_protocol(self):
         self.ui.txtEdProto.setEnabled(False)
+        self.ui.txtEdProto.setText("Demodulating...")
+        qApp.processEvents()
+
         self.proto_analyzer.get_protocol_from_signal()
 
     def show_protocol(self, old_view=-1, refresh=False):