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[Rachel Greenham <1291362@xxxxxxxxxxxxxxxxxx>]

This was observed with both a RadeonHD 7750 and Intel HD4600; both using
stock opensource drivers/mesa et al. Two separate machines, btw. I'm
afraid I sold my nVidia card that I used to use, but the fact those
can't drive more than 2 monitors at once means I wouldn't have chosen
the configuration that revealed it in the first place (ie: wanting
launcher only on middle of three monitors). I suppose it's possible that
nVidia's TwinView may be having an effect, if it means the logic of how
it handles multi-monitor is reflected up at the levels at which Launcher
is coded. (In that case Nouveau might show it.) But remember from
earlier observations: this only occurs if the launcher is placed on one
screen, not all of them, and that the screen it's placed on is *not* the
one on the left.

Is clearly a bug :-) Can't possibly be a design feature a: that the
launcher behaves differently on different monitors of a multi-monitor
setup, and b: that it works correctly exactly once per session. *Never*
working would at least imply malign design choice! ;-)

Also, it didn't happen in Saucy. I'd had that Launcher-in-the-middle
config for some time before the upgrade to Trusty beta.

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https://bugs.launchpad.net/bugs/1291362

Title:
  Apps locked to launcher only launch once per session on dual monitor
  system.

Status in “unity” package in Ubuntu:
  Triaged

Bug description:
  In Trusty:

  On a dual monitor system with the launcher on the right hand screen,
  an application that has been "locked to launcher", (including those
  there by default) can only be clicked on once per session to actually
  launch the application. After that it's unresponsive to clicks,
  although right-click actions work.

  Seems to affect all apps, including "Files".

  To repeat, for any application not already on the launcher bar:

  Launch the application using the dash.

  Right-click on its launcher icon and select "Lock to Launcher"

  Quit the application.

  Click on its launcher icon. It should launch again.

  Quit it again.

  Click on its launcher icon again. It won't work this time. It looks
  like dragging would work, but its operation as a launcher will not.

  NB: I haven't installed any hacks eg: click-to-minimise. Seen this on
  two systems upgraded from saucy to trusty. (One with AMD graphics, one
  with Intel, so I doubt that's relevant either.)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140311-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Wed Mar 12 13:10:56 2014
  InstallationDate: Installed on 2014-03-08 (3 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-03-10 (1 days ago)

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