falsely triggered half-maximize when mouse gets close to the left

[Andrey Gelman]

I observed this when 2 instantiations of Firefox were opened on 2 differenr desktop views, or short time after one of them was closed.

When the mouse gets close to the screen left, the transparent-orange-bar appears like we were about to 'half-maximize' some window, however there is no such window - nothing is 'half-maximized', the orange bar stays untill I manage, somehow, to get rid of it.
Some way to get rid of it is to select / deselect desktop view switch.

In similar conditions, Firefox stops respond keyboard input - no URL, no text fields on the web page.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.24.0-0ubuntu2b1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,mousepoll,regex,vpswitch,snap,gnomecompat,place,wall,move,resize,imgpng,animation,expo,session,workarounds,ezoom,staticswitcher,fade,scale,unityshell]
Date: Thu Nov 24 13:45:58 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)