Alt Tab Switcher does not always show all apps

[Rick Spencer]

Steps:
1. Open several apps in quick succession
2. look at the launcher to confirm all apps are running
3. hold down alt-tab

Result:
Notice that not all apps are in the alt-tab switcher

Expected:
Alll apps are in the switcher

Workaround:
Change workspaces and then change back. After that, all the apps will be in the alt-tab switcher.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.92-0ubuntu1
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,vpswitch,mousepoll,wall,imgpng,gnomecompat,snap,regex,animation,grid,place,move,workarounds,expo,fade,session,scale,ezoom,unityshell]
Date: Wed Feb 22 08:06:31 2012
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Alpha i386 (20100329)
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-01-20 (32 days ago)