some windows are shown incorrectly

Sometimes some maximized windows (banshee, firefox, thunderbird) are shown incorrectly. There is free space in the top of the window.

To reproduce:
1. Start Banshee player
2. Start track playing
3. Minimize Banshee window
4. Right click on Banshee icon in the launcher and click exit in this menu
5. Open Banshee using sound menu

The image showing this bug with banshee is attached to this report

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.16-0ubuntu1~natty1
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,move,place,obs,grid,regex,compiztoolbox,gnomecompat,resize,imgpng,mousepoll,text,session,vpswitch,zoom,snap,animation,unitymtgrabhandles,workarounds,wall,expo,ezoom,staticswitcher,fade,scale,scaleaddon,unityshell]
Date: Sun Jul 31 01:28:43 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007.1)
ProcEnviron:
 LANGUAGE=ru:en
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-05-22 (69 days ago)