Cannot go from bottom right to top left workspace in one move

Steps to reproduce:
1. go to bottom right workspace by pressing Ctrl + Alt + Arrow Down and Right keys at once
2. try go back

it requires go up and right or left and up, from other workspaces it works in cross directions

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
ApportVersion: 2.0-0ubuntu4
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]
CrashDB: unity
Date: Sat Apr 7 02:03:02 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)