Same issue for me. There is a 'block' in the left/under corner. And Alt , Tab had a issue. As shown in the pictures below:
http://ubuntuone.com/4UmrC0vN6SNkICdQaJhKpR http://ubuntuone.com/0LOAR4NWN5XTwJl5ydRU2W -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1100970 Title: [gen3] Dash background flickers and blur is misplaced on intel graphics To manage notifications about this bug go to: https://bugs.launchpad.net/nux/+bug/1100970/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp