Screen blinking with some programs

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http://askubuntu.com – My computer is a HP dv6 with 8gb ram, 500gb hdd and a amd radeon hd 6480 graphics card and dual core cpu. Now here is my problem: When I try to run some programs such as gucvie and xbmc, the screen blinks on and off. I have tried using both the opensource & proprietary drivers for my graphics card. Running these programs in terminal displays no errors. Any clues here? (HowTos)