Safari won't play certain videos

Hi there,
it came to my attention that my Safari (latest version) won't play any video on the site "www.collegehumor.com". YouTube and every other popular site works fine for me. After googling this problem, I tried to play the videos with a different user; without success. After that, I uninstalled the Flash Player and reinstalled it (latest version), because this was suggested by my google searches... but I still can't play any video on collegehumor.com.
Has anyone any idea what the problem might be?
thanks in advance!

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