Panel menu items had lost focus on active

 Probably this is not a bug, just particular glitch in graphic subsystem - I've tried to find similar opened bugs, but I couldn't.
 However, using Unity in Ubuntu 12.04 beta panel menu items had lost focus on mouse hover.

 Steps to reproduce:
 - just after login open some application (i.e. Terminal)
 - navigate mouse to Panel Menu Bar at the top of the screen
 - feel free for selecting menu items - it should be focused correctly at the first time (see picture 1 in the attachment)
 - open some another application (i.e. Firefox)
 - after couple minutes of working, switch to any application (Terminal or Firefox)
 - navigate mouse to Panel Menu Bar at the top of the screen
 - press mouse button on File (or on any other Main Menu item) and try to hover mouse through all current menu items

 What should happens:
 - each current focused menu item should be highlighted

 What happens:
 - no any highlights on current focused menu item (see picture 2 in the attachment)

 Sorry, if this bug is duplicated or not reproducible.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.93-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Fri Mar 9 17:23:15 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)