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I have a strange problem with the visibility of application windows (Unity / 14.04). Sometimes an application seems to be running, but without a visible window. When I click on their launcher icon, nothing actually happens.

What I do see is some kind of an empty arrow (>), instead of the usual solid one, and when I take a screen shot, the applications seems to be running correctly, the screen shot shows something I don't see!!

How can I find out what is the cause of this?

Edit:
After I enabled workspaces, I have another problem: I can move windows between workspaces, it looks as if they are one.

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    Sounds a bit as if you are on the wrong workspace, and the launcher does not take you to the right one. could you look at the other workspace(s) to see if the application windows are there? – Jacob Vlijm Jan 2 '15 at 14:20
  • Could you try System Settings > Appearance > Behaviour (tab) > Enable workspaces? – Jacob Vlijm Jan 2 '15 at 14:54
  • OK thnks... here they are.... – Yehuda Berkovitz Jan 2 '15 at 15:13
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    @Fabby edited the question and posted my answer. – Jacob Vlijm Jan 3 '15 at 18:44
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    Graag gedaan! ;-) – Fabby Jan 3 '15 at 20:55
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I was facing similar problem, but the solution was quite simple. The problem occurs because two monitors are connected to the PC. The windows which were not displaying were displayed on the other monitor that was turned off.

See this post on Ubuntu Forums

| improve this answer | |
  • @VolkerSiegel I disagree. It does address a vague symptom some users might be having about their setups. I have a monitor that is connected to my graphics card by both HDMI and VGA(for redundancy) and I kept thinking that I will need to reinstall Ubuntu, but this solves that issue. – cst1992 Feb 24 '16 at 3:44
  • Oh, I see your point - right! I'll remove my comment above, and ask for the other to also be removed. Thanks for your insight! – Volker Siegel Feb 24 '16 at 6:24

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