Index: b/vncviewer/DesktopWindow.cxx
===================================================================
--- a/vncviewer/DesktopWindow.cxx
+++ b/vncviewer/DesktopWindow.cxx
@@ -207,6 +207,8 @@ DesktopWindow::~DesktopWindow()
 
   delete statsGraph;
 
+  delete viewport;
+
   // FLTK automatically deletes all child widgets, so we shouldn't touch
   // them ourselves here
 }
Index: b/vncviewer/Viewport.cxx
===================================================================
--- a/vncviewer/Viewport.cxx
+++ b/vncviewer/Viewport.cxx
@@ -189,6 +189,18 @@ Viewport::Viewport(int w, int h, const r
 
 Viewport::~Viewport()
 {
+  // Send release for every pressed key
+  for(DownMap::iterator iter = downKeySym.begin(); iter != downKeySym.end(); ++iter) {
+    try {
+      if (iter->first > 0xff)
+        cc->writer()->writeKeyEvent(iter->second, 0, false);
+      else
+        cc->writer()->writeKeyEvent(iter->second, iter->first, false);
+    } catch (rdr::Exception& e) {
+      // ignore
+    }
+  }
+
   // Unregister all timeouts in case they get a change tro trigger
   // again later when this object is already gone.
   Fl::remove_timeout(handlePointerTimeout, this);
Index: b/vncviewer/vncviewer.cxx
===================================================================
--- a/vncviewer/vncviewer.cxx
+++ b/vncviewer/vncviewer.cxx
@@ -107,6 +107,8 @@ static const char *about_text()
   return buffer;
 }
 
+static CConn *cc;
+
 void exit_vncviewer(const char *error)
 {
   // Prioritise the first error we get as that is probably the most
@@ -177,6 +179,16 @@ static void CleanupSignalHandler(int sig
   // CleanupSignalHandler allows C++ object cleanup to happen because it calls
   // exit() rather than the default which is to abort.
   vlog.info(_("Termination signal %d has been received. TigerVNC Viewer will now exit."), sig);
+  delete cc;
+  exit(1);
+}
+
+static int CleanupXIOErrorHandler(Display *dpy)
+{
+  // CleanupSignalHandler allows C++ object cleanup to happen because it calls
+  // exit() rather than the default which is to abort.
+  vlog.info("XErrorHandler called");
+  delete cc;
   exit(1);
 }
 
@@ -587,6 +599,9 @@ int main(int argc, char** argv)
   XkbSetDetectableAutoRepeat(fl_display, True, NULL);
 #endif
 
+  fl_open_display();
+  XSetIOErrorHandler(CleanupXIOErrorHandler);
+
   CSecurity::upg = &dlg;
 #ifdef HAVE_GNUTLS
   CSecurityTLS::msg = &dlg;
@@ -672,7 +687,7 @@ int main(int argc, char** argv)
 #endif
   }
 
-  CConn *cc = new CConn(vncServerName, sock);
+  cc = new CConn(vncServerName, sock);
 
   while (!exitMainloop)
     run_mainloop();