This may or may not be a bug in Glade, but I'm unable to find out. The problem is with InfoBar. Glade adds
<child> <object class="GtkInfoBar" id="infobar1"> <child internal-child="content_area"> <packing> </packing> </child> <child internal-child="action_area"> <packing> </packing> </child> When you try to load the UI definition using Gtk.Builder.add_from_file, then it complains about those two packing tags. Commenting them out removes the issues. But of course, that means a lot of manual editing of XML-files all the time, so it's a very annoying bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/998208 Title: Unhandled tag 'packing' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/998208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs