[Solved] YouTube videos freezing, audio keeps playing

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http://crunchbanglinux.org – Clean install of the latest Statler 64-bit yesterday. In both Google Chrome and Firefox, YouYube videos are not playing properly. They start playing normally, but then the video freezes (including the progress bar, so it's more than the video, I guess), but the audio keeps playing normally. Every once in a while the video will start again, picking up from where it should be according to the audio. Then it will freeze again, sometimes with horizontal stripes in which I can see the video playing but just in those thin slivers. I can trigger the freeze immediately if I click on the fullscree (HowTos)