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enter image description here It also happens when I log out and log in.
It did not happen in Raring or Saucy beta 2.
I have Intel's integrated GPU and no additional drivers. Unity never behaved weird before in my computer.
Is there any workaround?

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Try the following, as I believe it is related to issues with Intel iGPU drivers which ship with Ubuntu by default, as a number of other Intel users are having this same problem.

sudo add-apt-repository -y ppa:oibaf/graphics-drivers; sudo apt-get update; sudo apt-get upgrade -y; sudo apt-get dist-upgrade -y

This will add the oibaf PPA, switch the obaif PPA to Raring as it currently doesn't support Saucy yet, then upgrade all of your open source graphics drivers to the latest 'Updated and Optimized' open source graphics drivers.

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  • Would I have to input the commands one by one or can I paste the whole thing together and press enter? Oct 21, 2013 at 7:58
  • Paste the whole thing together. I hate posting one by one, so I always string everything together with ';'.
    – mmstick
    Oct 21, 2013 at 8:30
  • Ok, it has fixed the problem but now dash takes more than 30 seconds to appear and till then my computer is unresponsive. Oct 21, 2013 at 9:14
  • Sounds like ubuntuforums.org/showthread.php?t=2045769 which still points to a graphics driver bug. Try rerunning sudo apt-get upgrade -y; sudo apt-get dist-upgrade -y then reboot. I find it strange that you are experiencing this bug with an Intel iGPU though as they are supposed to be very well supported. Something else you can try is sudo rm ~/.compiz ~/.config/compiz-1 -R then reboot.
    – mmstick
    Oct 21, 2013 at 9:25
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