diff --git a/rtexif/pentaxattribs.cc b/rtexif/pentaxattribs.cc
index f41090c82..ab15b73c3 100644
--- a/rtexif/pentaxattribs.cc
+++ b/rtexif/pentaxattribs.cc
@@ -964,7 +964,9 @@ public:
 		case 2: return "Depth";
 		case 3: return "MTF";
 		}
+		return"Normal";
 	}
+
 };
 PAAFModeInterpreter paAFModeInterpreter;
 
diff --git a/rtgui/shcselector.cc b/rtgui/shcselector.cc
index c11b67b10..7dec130d6 100644
--- a/rtgui/shcselector.cc
+++ b/rtgui/shcselector.cc
@@ -120,6 +120,7 @@ bool SHCSelector::on_expose_event(GdkEventExpose* event) {
         cr->fill_preserve ();
         cr->stroke ();
     }
+    return true;
 }
 
 bool SHCSelector::on_button_press_event (GdkEventButton* event) {
@@ -135,6 +136,7 @@ bool SHCSelector::on_button_press_event (GdkEventButton* event) {
             break;
         }
     queue_draw ();
+    return true;
 }
 
 bool SHCSelector::on_button_release_event (GdkEventButton* event) {
@@ -143,6 +145,7 @@ bool SHCSelector::on_button_release_event (GdkEventButton* event) {
         movingPosition = -1;
         queue_draw ();
     }
+    return true;
 }
 
 bool SHCSelector::on_motion_notify_event (GdkEventMotion* event) {
@@ -163,6 +166,7 @@ bool SHCSelector::on_motion_notify_event (GdkEventMotion* event) {
             cl->shcChanged ();
         queue_draw ();
     }
+    return true;
 }
 
 void SHCSelector::styleChanged (const Glib::RefPtr<Gtk::Style>& style) {
diff --git a/rtgui/thumbimageupdater.cc b/rtgui/thumbimageupdater.cc
index cbe7a9121..cbdc6313b 100644
--- a/rtgui/thumbimageupdater.cc
+++ b/rtgui/thumbimageupdater.cc
@@ -19,7 +19,7 @@
 #include <thumbimageupdater.h>
 #include <gtkmm.h>
 
-#define threadNum 8
+#define threadNum 1
 ThumbImageUpdater thumbImageUpdater;
 
 ThumbImageUpdater::ThumbImageUpdater () 
@@ -68,7 +68,7 @@ void ThumbImageUpdater::process () {
         stopped = false;
 
         if(!threadPool)
-            threadPool = new Glib::ThreadPool(threadNum,0);
+            threadPool = new Glib::ThreadPool(threadNum,1);
      
         //thread = Glib::Thread::create (sigc::mem_fun(*this, &ThumbImageUpdater::process_), (unsigned long int)0, true, true, Glib::THREAD_PRIORITY_NORMAL);
         process_();