unity panels disappear when switch to "show desktop" from full screen application

[amishaa]

Result - see screenshot.
Probably, it's unity bug.
How to reproduce:
1. Run firefox.
2. Press F11 (or choose use full screen mode).
3. Using alt+tab choose "show desktop" option.

When switched on "blank" desktop printscreen doesn't work correctly.
Icons are still present, alt+tab work correctly.
When you choose to any application using alt+tab panels return.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.10.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
Uname: Linux 3.5.0-21-generic i686
ApportVersion: 2.6.1-0ubuntu9
Architecture: i386
CompizPlugins: [core,composite,opengl,decor,regex,snap,compiztoolbox,move,mousepoll,animation,grid,vpswitch,imgpng,place,wall,gnomecompat,resize,session,workarounds,expo,fade,scale,ezoom,unityshell]
Date: Mon Dec 24 13:21:20 2012
EcryptfsInUse: Yes
InstallationDate: Installed on 2012-09-22 (92 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 (20120817.3)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to quantal on 2012-10-20 (64 days ago)

[Sami Jaktholm (sjakthol)]

I can confirm this behavior with both Unity 6.10.0-0ubuntu2 (quantal) and unity trunk r3007.