diff -ur polkit-qt-1-0.96.1/agent/polkitqt1-agent-listener.cpp polkit-qt-1-0.96.1_new/agent/polkitqt1-agent-listener.cpp
--- polkit-qt-1-0.96.1/agent/polkitqt1-agent-listener.cpp	2010-10-15 21:30:06.295018901 +0200
+++ polkit-qt-1-0.96.1_new/agent/polkitqt1-agent-listener.cpp	2010-10-15 21:22:34.102034730 +0200
@@ -39,6 +39,7 @@
 {
 public:
     PolkitAgentListener *listener;
+    void *registeredHandle;
 };
 
 Listener::Listener(QObject *parent)
@@ -66,6 +67,8 @@
     qDebug("Destroying listener");
 
     ListenerAdapter::instance()->removeListener(this);
+    if (d->registeredHandle)
+        polkit_agent_listener_unregister(d->registeredHandle);
     if (d->listener != NULL)
         g_object_unref(d->listener);
 }
@@ -73,17 +76,24 @@
 bool Listener::registerListener(PolkitQt1::Subject *subject, const QString &objectPath)
 {
     GError *error = NULL;
-
-    bool r = polkit_agent_register_listener(d->listener,
+    d->registeredHandle = polkit_agent_listener_register(d->listener,
+                                            POLKIT_AGENT_REGISTER_FLAGS_NONE,
                                             subject->subject(),
                                             objectPath.toAscii().data(),
+                                            NULL,
                                             &error);
+
     if (error != NULL) {
         qWarning() << QString("Cannot register authentication agent: %1").arg(error->message);
         g_error_free(error);
         return false;
     }
-    return r;
+    if (d->registeredHandle == NULL)
+    {
+        qWarning() << QString("Cannot register authentication agent!");
+        return false;
+    }
+    return true;
 }
 
 const PolkitAgentListener *Listener::listener()
diff -ur polkit-qt-1-0.96.1/core/polkitqt1-authority.cpp polkit-qt-1-0.96.1_new/core/polkitqt1-authority.cpp
--- polkit-qt-1-0.96.1/core/polkitqt1-authority.cpp	2010-07-03 12:17:13.000000000 +0200
+++ polkit-qt-1-0.96.1_new/core/polkitqt1-authority.cpp	2010-10-15 15:21:47.396705581 +0200
@@ -177,12 +177,17 @@
     m_revokeTemporaryAuthorizationsCancellable = g_cancellable_new();
     m_revokeTemporaryAuthorizationCancellable = g_cancellable_new();
 
+    GError *gerror = NULL;
     if (pkAuthority == NULL) {
-        pkAuthority = polkit_authority_get();
+        pkAuthority = polkit_authority_get_sync(NULL, &gerror);
+        if (gerror != NULL) {
+            setError(E_GetAuthority, gerror->message);
+            g_error_free(gerror);
+            return;
+        }
     }
 
     if (pkAuthority == NULL) {
-        (E_GetAuthority);
         return;
     }