Non-indicator application prevents clicking on indicators

Binary package hint: unity

When running an application which opens a notification icon (eg. Jupiter, Pidgin...), clicking on most indicators doesn't work anymore.
Only the session indicator works (and enables access to other indicators too : first open the session indicator menu, then move the mouse over other indicators).
Closing the application solves the problem.

May be related to bug 758923 or bug 761409.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.12-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: wl
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,commands,mousepoll,resize,regex,move,wall,snap,gnomecompat,vpswitch,grid,animation,workarounds,imgpng,compiztoolbox,obs,place,unitymtgrabhandles,expo,session,ezoom,staticswitcher,fade,scale,unityshell]
Date: Mon May 30 09:10:31 2011
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANGUAGE=fr:fr_FR:en
 LANG=fr_FR.UTF-8
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)