All video except for web video appears as just black!

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http://crunchbang.org – It is as the titles says. Unless I'm playing web videos in Firefox or Midori, all videos play and I can hear the audio going normally, but the video itself is just black!I tried playing all sorts of video formats with VLC and got the same results. (Including the feed from my webcam.) So at first I just thought it was a VLC problem. But then I went to test webcam settings in Jitsi, and the webcam preview is just all black too!I've got everything up to date, and I'm running Crunchbang on a Dell Inspiron Mini 1010. I'm at a loss as to what to do here. Please help me. (HowTos)