PyGTK applications don't receive MenuItem events

I noticed that menubar items in the "exaile" music player application no longer appeared after upgrading to saucy. However, the menu items appeared fine in xfce and gnome.

I think the problem may be related to this bug: https://bugs.launchpad.net/ubuntu/+source/unity-gtk-module/+bug/1208019

I've attached a PyGTK program and sample output from it that demonstrates the problem. Run the test program, mouse over the generated menu item and click it. Observe that under Unity, the MenuItem receives a GDK_VISIBILITY_NOTIFY event, but then no further events. Under Gnome, a wide range of events are received during the test.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity-gtk2-module 0.0.0+13.10.20130716.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Mon Oct 28 15:47:02 2013
InstallationDate: Installed on 2010-10-12 (1111 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
MarkForUpload: True
SourcePackage: unity-gtk-module
UpgradeStatus: Upgraded to saucy on 2013-10-18 (9 days ago)