diff --git a/qubesmanager/qube_manager.py b/qubesmanager/qube_manager.py
index 64bd2dd..95664e8 100644
--- a/qubesmanager/qube_manager.py
+++ b/qubesmanager/qube_manager.py
@@ -820,8 +820,20 @@ class VmManagerWindow(ui_qubemanager.Ui_VmManagerWindow, QMainWindow):
             QMessageBox.Yes | QMessageBox.Cancel)
 
         if reply == QMessageBox.Yes:
+            failed = []
             for info in selected_vms:
-                info.vm.template = template
+                try:
+                    info.vm.template = template
+                except:
+                    failed.append(info.name)
+
+            if failed:
+                info_dialog = QMessageBox(self)
+                info_dialog.setWindowTitle(self.tr("Warning!"))
+                info_dialog.setText(
+                        self.tr("Some template change failed: {0} "
+                            ).format(", ".join(failed)))
+                info_dialog.show()
 
     def change_network(self, netvm_name):
         selected_vms = self.get_selected_vms()
@@ -836,25 +848,39 @@ class VmManagerWindow(ui_qubemanager.Ui_VmManagerWindow, QMainWindow):
             return
 
         try:
-            check_power = any(info.state['power'] == 'Running' for info
-                    in self.get_selected_vms())
-            netvm = self.qubes_cache.get_vm(name=netvm_name)
-            if check_power and netvm.state['power'] != 'Running':
-                reply = QMessageBox.question(
-                    self, self.tr("Qube Start Confirmation"),
-                    self.tr("<br>Can not change netvm to a halted Qube.<br>"
-                        "Do you want to start the Qube <b>'{0}'</b>?").format(
-                        netvm_name),
-                    QMessageBox.Yes | QMessageBox.Cancel)
+            if netvm_name is not None:
+                check_power = any(info.state['power'] == 'Running' for info
+                        in self.get_selected_vms())
+                netvm = self.qubes_cache.get_vm(name=netvm_name)
+                if check_power and netvm.state['power'] != 'Running':
+                    reply = QMessageBox.question(
+                        self, self.tr("Qube Start Confirmation"),
+                        self.tr("<br>Can not change netvm to a halted Qube.<br>"
+                            "Do you want to start the Qube <b>'{0}'</b>?").format(
+                            netvm_name),
+                        QMessageBox.Yes | QMessageBox.Cancel)
 
-                if reply == QMessageBox.Yes:
-                    with common_threads.busy_cursor():
-                        netvm.vm.start()
-                else:
-                    return
+                    if reply == QMessageBox.Yes:
+                        with common_threads.busy_cursor():
+                            netvm.vm.start()
+                    else:
+                        return
 
+            failed = []
             for info in self.get_selected_vms():
-                info.vm.netvm = netvm_name
+                try:
+                    info.vm.netvm = netvm_name
+                except:
+                    failed.append(info.name)
+
+            if failed:
+                info_dialog = QMessageBox(self)
+                info_dialog.setWindowTitle(self.tr("Warning!"))
+                info_dialog.setText(
+                        self.tr("Some network change failed: {0} "
+                            ).format(", ".join(failed)))
+                info_dialog.show()
+
         except exc.QubesValueError as ex:
             QMessageBox.warning(
                 self,