Public bug reported:

happened to me at least twice.

An application window is not responding (but not greyed so not
considered not responding ), CPU load is low(no high computing) as well
as i/o.

This time the application was eclipse Kepler
Last time I think it was firefox

Well, then the mouse can't click. I move the pointer, I can use super
key to show unity board, but I can't click anywhere just as there was a
glass panel between the mouse and the applications.

I press ctrl alt F1, killall -9 "application" (firefox or java) and on
ctrl alt F7 I got my mouse click again.

I think this is a bug in the renderer library, maybe a race condition.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11
Uname: Linux 3.8.0-20-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
Date: Wed May 15 09:24:26 2013
InstallationDate: Installed on 2011-07-05 (679 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-04-26 (18 days ago)
--- 
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
DistroRelease: Ubuntu 13.04
InstallationDate: Installed on 2011-07-05 (679 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MarkForUpload: True
NonfreeKernelModules: nvidia wl
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11
Tags: gnome3-ppa raring third-party-packages
Uname: Linux 3.8.0-20-generic x86_64
UpgradeStatus: Upgraded to raring on 2013-04-26 (18 days ago)
UserGroups: adm admin cdrom davfs2 dialout fuse libvirtd lpadmin plugdev 
sambashare

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug apport-collected gnome3-ppa raring 
third-party-packages

** Tags added: apport-collected

** Description changed:

  happened to me at least twice.
  
  An application window is not responding (but not greyed so not
  considered not responding ), CPU load is low(no high computing) as well
  as i/o.
  
  This time the application was eclipse Kepler
  Last time I think it was firefox
  
  Well, then the mouse can't click. I move the pointer, I can use super
  key to show unity board, but I can't click anywhere just as there was a
  glass panel between the mouse and the applications.
  
  I press ctrl alt F1, killall -9 "application" (firefox or java) and on
  ctrl alt F7 I got my mouse click again.
  
  I think this is a bug in the renderer library, maybe a race condition.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
  ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11
  Uname: Linux 3.8.0-20-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
  Date: Wed May 15 09:24:26 2013
  InstallationDate: Installed on 2011-07-05 (679 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: Upgraded to raring on 2013-04-26 (18 days ago)
+ --- 
+ ApportVersion: 2.9.2-0ubuntu8
+ Architecture: amd64
+ CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
+ DistroRelease: Ubuntu 13.04
+ InstallationDate: Installed on 2011-07-05 (679 days ago)
+ InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
+ MarkForUpload: True
+ NonfreeKernelModules: nvidia wl
+ Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
+ PackageArchitecture: amd64
+ ProcEnviron:
+  TERM=xterm
+  PATH=(custom, no user)
+  XDG_RUNTIME_DIR=<set>
+  LANG=fr_FR.UTF-8
+  SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 3.8.0-20.31-generic 3.8.11
+ Tags: gnome3-ppa raring third-party-packages
+ Uname: Linux 3.8.0-20-generic x86_64
+ UpgradeStatus: Upgraded to raring on 2013-04-26 (18 days ago)
+ UserGroups: adm admin cdrom davfs2 dialout fuse libvirtd lpadmin plugdev 
sambashare

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https://bugs.launchpad.net/bugs/1180260

Title:
  frozen applications keep the mouse click focus

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