John, This appears to be a Catalyst (fglrx) driver bug. Please try removing the driver and using radeon instead.
Alternatively you can try reverting back to the rendering method used in Ubuntu 12.04: CCSM > OpenGL > framebuffer_object = OFF vertex_buffer_object = OFF always_swap_buffers = OFF ** Summary changed: - Unity flickering on window updates + [fglrx] Unity flickering on window updates ** Also affects: fglrx-installer (Ubuntu) Importance: Undecided Status: New ** Changed in: fglrx-installer (Ubuntu) Status: New => Incomplete ** Changed in: unity (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to fglrx-installer in Ubuntu. https://bugs.launchpad.net/bugs/1070275 Title: [fglrx] Unity flickering on window updates To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1070275/+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