Index: uikit.py
==================================================================
--- uikit.py
+++ uikit.py
@@ -216,11 +216,11 @@
         try:
             # Gtk3 only
             normal_bg = widget.get_style_context().get_background_color(gtk.StateType.NORMAL)
             normal_bg = normal_bg.to_string()
         except:
-            normal_bg = "#ffffff"  # Gtk2 default
+            normal_bg = ""  # just live with the inevitable Warning
         return normal_bg
 
 
     #-- treeview for categories
     #