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[Chris Kaye <878627@xxxxxxxxxxxxxxxxxx>]

I'm not sure if my issue is related or not, but for me:
Firefox has no triangle at all, to show that it is open.
Neither does it show up in the Alt-Tab list, whatever work space I'm in.
Clicking on the Firefox button opens a new firefox window.

I haven't tried restarting my computer yet though, so that may fix it...

** Attachment added: "Not recognising Firefox as open."
   https://bugs.launchpad.net/ubuntu/+source/unity/+bug/878627/+attachment/3900272/+files/Firefox_no_Alt_Tab.png

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https://bugs.launchpad.net/bugs/878627

Title:
  unity regularly gets confused about Firefox's window

Status in BAMF Application Matching Framework:
  Confirmed
Status in Unity:
  Confirmed
Status in “bamf” package in Ubuntu:
  Confirmed
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  From time to time (I don't know when, it seems to happen at random
  intervals), Unity starts getting confused about Firefox's window
  state. Below are the symptoms:-

  1. Firefox, although maximized, no longer has its menu showing up when the pointer is over the Unity panel. Likewise, its window title no longer appears in the panel. When the Firefox window is focused and maximized, the panel is blank where the window buttons and menu or title should be, whether or not the pointer is hovering on the panel).
  2. The Firefox icon on the Unity launcher shows a filled triangle on the right side, but an empty triangle on the left side, which seems to indicate that Firefox's window is focused, although not on the current workspace.
  3. Alt+Tab orders Firefox's window to the back of the list (alt_tab_bias_viewport = true).
  4. Alt+Grave over Firefox's icon causes Compiz to segfault (I should have gotten a stack trace; I'll do that next time).
  5. Selecting Firefox's icon from Alt+Tab does nothing.
  6. Clicking Firefox's launcher in the sidebar does nothing.

  And here's the weird part: Other application switchers in Compiz, e.g.
  Ring switcher, and Scale, work as expected. Scale even properly
  detects the workspace that Firefox is on, judging from the [N] suffix
  to Firefox window's title. This indicates that the bug is probably not
  in compiz, but in Unity or something it uses.

  All of the above symptoms are for one issue. The symptoms either
  appear all at once, or not at all. The only way to get rid of this
  seems to be to restart Unity or the application in question (Firefox)

  ii  firefox-trunk                            10.0~a1~hg20111018r78888-0ubuntu1~umd3   Safe and easy web browser from Mozilla
  ii  unity                                    4.24.0-0ubuntu2                          Interface designed for efficiency of space and interaction.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: unity 4.24.0-0ubuntu2
  Uname: Linux 3.0.4-ck1-hyper1 x86_64
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,snap,move,commands,resize,annotate,resizeinfo,gnomecompat,text,obs,mousepoll,regex,place,widget,extrawm,vpswitch,grid,clone,compiztoolbox,imgpng,session,showmouse,put,wall,ring,screenshot,unitymtgrabhandles,animation,workarounds,fade,showdesktop,expo,scale,ezoom,scaleaddon,scalefilter,unityshell]
  Date: Thu Oct 20 10:46:43 2011
  SourcePackage: unity
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (6 days ago)

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