Are you using NVIDIA driver with TwinView? My config after reboot the computer is still OK.
grep UScreen ~/.xsession-errors UScreen: Screen geometry changed: UScreen: #0: ? 1680x1050 +1280+0 UScreen: #1: ? 1280x1024 +0+0 UScreen: No primary monitor has been configured via Xrandr. UScreen: Primary monitor is #0 according to GDK and confirmed by TwinViewXineramaInfoOrder. UScreen: Primary monitor for Unity is #0. dpkg -l | grep unity | grep vv ii libunity-core-4.0-4 4.24.0-0ubuntu2b1vv3 Core library for the Unity interface. ii unity 4.24.0-0ubuntu2b1vv3 Interface designed for efficiency of space and interaction. ii unity-common 4.24.0-0ubuntu2b1vv3 Common files for the Unity interface. ii unity-services 4.24.0-0ubuntu2b1vv3 Services for the Unity interface -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/742544 Title: Launcher is shown on the wrong screen in some multi-monitor setups To manage notifications about this bug go to: https://bugs.launchpad.net/ayatana-design/+bug/742544/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs