diff --git a/rtengine/dcraw.cc b/rtengine/dcraw.cc
index 8cfed601d..09fe0ce40 100644
--- a/rtengine/dcraw.cc
+++ b/rtengine/dcraw.cc
@@ -8973,6 +8973,13 @@ dcrMutex->lock ();
   image = (UshORt (*)[4])calloc (height*width*sizeof *image + meta_length, 1);
   meta_data = (char *) (image + height*width);
 
+  if(!image)
+  {
+    fclose(ifp);
+    dcrMutex->unlock ();
+    return 3;
+  }
+
   if (setjmp (failure)) {
       if (image)
         free (image);
diff --git a/rtgui/thumbimageupdater.cc b/rtgui/thumbimageupdater.cc
index 2e90e9eb8..1e78cb320 100644
--- a/rtgui/thumbimageupdater.cc
+++ b/rtgui/thumbimageupdater.cc
@@ -25,14 +25,15 @@ ThumbImageUpdater thumbImageUpdater;
 ThumbImageUpdater::ThumbImageUpdater () 
     : tostop(false), stopped(true), qMutex(NULL), startMutex(NULL) {
 
-    threadPool = new Glib::Thread* [threadNum];
-
+    //threadPool = new Glib::Thread* [threadNum];
+    threadPool = 0;;
+    
 }
 
-ThumbImageUpdater::~ThumbImageUpdater ()
-{
-    delete threadPool;
-}
+//ThumbImageUpdater::~ThumbImageUpdater ()
+//{
+//    delete threadPool;
+//}
 
 void ThumbImageUpdater::add (Thumbnail* t, const rtengine::procparams::ProcParams& params, int height, bool* priority, ThumbImageUpdateListener* l) {
 
@@ -69,7 +70,15 @@ void ThumbImageUpdater::process () {
     if (stopped) {
         #undef THREAD_PRIORITY_LOW
         stopped = false;
+      //  if (thread)
+        //    thread->join();
+
+        if(!threadPool)
+            threadPool = new Glib::ThreadPool(4,0);
         thread = Glib::Thread::create(sigc::mem_fun(*this, &ThumbImageUpdater::process_), (unsigned long int)0, true, true, Glib::THREAD_PRIORITY_LOW);
+        //qMutex->lock ();
+       // threadPool->push(sigc::mem_fun(*this, &ThumbImageUpdater::process_));
+        //qMutex->unlock ();
     }
 }
 
@@ -78,34 +87,50 @@ void ThumbImageUpdater::process_ () {
     stopped = false;
     tostop = false;
 
-   
+  // GError *err;
     while (!tostop && !jqueue.empty ()) {
 
         qMutex->lock ();
-        int threads = 0;
-        for (; threads<threadNum && !jqueue.empty (); threads++) {
+        //int threads = 0;
+        //for (; threads<threadNum && !jqueue.empty (); threads++) {
             // find first entry having update priority, if any
+
+
+     //   while(!jqueue.empty())
+       // {
             std::list<Job>::iterator i;
             for (i=jqueue.begin (); i!=jqueue.end(); i++)
                 if (*(i->priority))
                     break;
+
+
             if (i==jqueue.end())
                 i = jqueue.begin();
-            Job current = *i;
+
+            Job current = *i;         
+            if (current.listener)                    
+                    threadPool->push(sigc::bind(sigc::mem_fun(*this, &ThumbImageUpdater::processJob), current));
+
+//                if(! threadPool)
+//                     threadPool = g_thread_pool_new((void*)&ThumbImageUpdater::processJob, (gpointer)&current, 4, FALSE,  &err);
+//                else
+//                    g_thread_pool_push(threadPool, (gpointer)current, &err);
+
+                //threadPool[threads] =
+                       // Glib::Thread::create (sigc::bind(sigc::mem_fun(*this, &ThumbImageUpdater::processJob), current), 0, false, true, Glib::THREAD_PRIORITY_LOW);
+
             jqueue.erase (i);
-            if (current.listener) 
-                threadPool[threads] = Glib::Thread::create(sigc::bind(sigc::mem_fun(*this, &ThumbImageUpdater::processJob), current), 0, true, true, Glib::THREAD_PRIORITY_LOW);
             //else
               //  threadPool[threads] = NULL;
-        }
+       // }
         qMutex->unlock ();
 
-        for (int j=0; j<threads; j++)
-            if (threadPool[j])
-                threadPool[j]->join ();
+ //       for (int j=0; j<threads; j++)
+   //         if (threadPool[j])
+     //           threadPool[j]-> join ();
 
-        for(int j =0; j <threadNum;j++)
-            threadPool[j] = NULL;
+        //for(int j =0; j <threadNum;j++)
+          //  threadPool[j] = NULL;
     }
     stopped = true;
 }
@@ -128,10 +153,12 @@ void ThumbImageUpdater::stop () {
         return; }
         
     gdk_threads_leave(); 
-    tostop = true; 
-    Glib::Thread::self()->yield(); 
-    if (!stopped) 
-        thread->join (); 
+    tostop = true;
+
+    Glib::Thread::self()->yield();
+    if (!stopped)
+        threadPool->shutdown(TRUE);
+        thread->join ();
     gdk_threads_enter();
 }
 
diff --git a/rtgui/thumbimageupdater.h b/rtgui/thumbimageupdater.h
index 916d453eb..e804ec159 100644
--- a/rtgui/thumbimageupdater.h
+++ b/rtgui/thumbimageupdater.h
@@ -22,6 +22,7 @@
 #include <glibmm.h>
 #include <rtengine.h>
 #include <thumbnail.h>
+#include <glib.h>
 
 class ThumbImageUpdateListener {
 
@@ -46,11 +47,11 @@ class ThumbImageUpdater {
     Glib::Thread* thread;
     Glib::Mutex* qMutex;
     Glib::Mutex* startMutex;
-    Glib::Thread **threadPool;
+    //Glib::Thread **threadPool;
+    Glib::ThreadPool * threadPool;
 
   public:
-    ThumbImageUpdater ();
-    ~ThumbImageUpdater ();
+    ThumbImageUpdater ();    
 
     void add        (Thumbnail* t, const rtengine::procparams::ProcParams& params, int height, bool* priority, ThumbImageUpdateListener* l);
     void process    ();