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Ubuntu 13.10 and earlier version 13.04 ? Icons in the tool bar at bottom of screen are unstable and flicker on and off then change to solid white blocks. Even the text above them is garbled when the mouse points at them. Also none of the Menu icons show up when Menu (Bottom Left corner) is selected. If I restart the PC the bottom toolbar is restored but selecting Menu causes the problem to return. Everything was fine until a service update was installed and then it has never been right since. Also an almost transparent pointed line appears diagonally across the screen occasionally. This is an HP notebook with a solid state drive installed and have been using Ubuntu with it without a problem for about 5 months. Thank you.. Jim

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Ubuntu 13.10 doesn't have a "toolbar at bottom of screen". What is the output from env | grep XDG_CURRENT_DESKTOP and echo $DESKTOP_SESSION? Have you installed some sort of "dock"? –  user25656 Oct 27 '13 at 5:04

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