desktop wall does not disappear when using keybindings with the super key

[Andreas Raster]

I changed the keybindings for moving within the desktop wall to super-c/x (to move left and right). When I use them the desktop wall appears normally, but when I release the keys it does not disappear until I hit escape, enter or another modifier key.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0+bzr2252ubuntu0+677 [origin: LP-PPA-unity-team]
ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14
Uname: Linux 3.2.0-22-generic x86_64
NonfreeKernelModules: vboxpci vboxnetadp vboxnetflt vboxdrv nvidia
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,grid,place,snap,regex,gnomecompat,dbus,imgpng,session,move,vpswitch,resize,wall,animation,resizeinfo,unitymtgrabhandles,fade,workarounds,scale,expo,ezoom,unityshell]
CrashDB: unity
Date: Sat Apr 7 04:27:02 2012
EcryptfsInUse: Yes
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-04-05 (1 days ago)