diff --git a/pitivi/render.py b/pitivi/render.py
index 6772babe293b1faef4f5e033506ebdacbc12ec67..bec8cdc7972d6a2a6d5fea24eb137a869ae767ab 100644
--- a/pitivi/render.py
+++ b/pitivi/render.py
@@ -1429,11 +1429,10 @@ class RenderDialog(Loggable):
 
         # Use HQ Proxy (or equivalent) only for unsupported assets
         if self.__automatically_use_proxies.get_active():
-            if self.app.proxy_manager.is_asset_format_well_supported(
-                    asset_target):
+            if self.app.proxy_manager.is_asset_format_well_supported(asset_target):
                 return asset_target
-            else:
-                proxy_unsupported = True
+
+            proxy_unsupported = True
 
         # Use HQ Proxy (or equivalent) whenever available
         if self.__always_use_proxies.get_active() or proxy_unsupported:
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index c9983464dd92617a7498397f5fd26a8d8374c06f..5da067ecdde1c7bc35be1b47b6e39904ae6f053f 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -2065,7 +2065,7 @@ class TimelineContainer(Gtk.Grid, Zoomable, Loggable):
         self.timeline.scroll_to_playhead(align=Gtk.Align.CENTER, when_not_in_view=True)
 
     def __add_effect_cb(self, unused_action, unused_parameter):
-        clip = self.timeline.selection.getSingleClip()
+        clip = self.timeline.selection.get_single_clip()
         if clip:
             self.effects_popover.set_relative_to(clip.ui)
             self.effects_popover.popup()
diff --git a/pitivi/transitions.py b/pitivi/transitions.py
index 09907b5690ea724aede57423d60dba4e77482491..1df39afaaacd645be16a812287e831345f060417 100644
--- a/pitivi/transitions.py
+++ b/pitivi/transitions.py
@@ -187,17 +187,14 @@ class TransitionsListWidget(Gtk.Box, Loggable):
     def _transition_selected_cb(self, unused_widget):
         transition_asset = self.get_selected_item()
         if not transition_asset:
-            # The user clicked between icons
+            # Nothing to apply. The user clicked between icons.
             return False
 
-        self.debug(
-            "New transition type selected: %s", transition_asset.get_id())
-        if transition_asset.get_id() == "crossfade":
-            self.props_widgets.set_sensitive(False)
-        else:
-            self.props_widgets.set_sensitive(True)
+        self.debug("New transition type selected: %s", transition_asset.get_id())
 
         self.element.get_parent().set_asset(transition_asset)
+        self._update_ui()
+
         self.app.write_action("element-set-asset",
                               asset_id=transition_asset.get_id(),
                               element_name=self.element.get_name())
diff --git a/pitivi/undo/undo.py b/pitivi/undo/undo.py
index 8e7ec0f19ba471ac8b665c844b6d4749491ffe93..000ef1bdd899a2ff53d2f1e7cb4bd37d9b646b33 100644
--- a/pitivi/undo/undo.py
+++ b/pitivi/undo/undo.py
@@ -438,6 +438,9 @@ class MetaChangedAction(UndoableAutomaticObjectAction):
         self.old_value = current_value
         self.new_value = new_value
 
+    def __repr__(self):
+        return "<MetaChangedAction %s.%s: %s -> %s>" % (self.auto_object, self.item, self.old_value, self.new_value)
+
     def do(self):
         self.auto_object.set_meta(self.item, self.new_value)