I have a new Gazelle professional, running Ubuntu 12.04, i7 processor, standard system graphics.
Often, when I stream a video online (youtube), the video plays back at ~2-3 times normal speed, with the audio obviously an unintelligible gibber. It doesn't do this all the time, but I cannot locate the setting/issue which causes it. Sometimes restarting (but never simply logging out) will correct the issue for awhile, but it comes back quickly.
Oh, I'm using Chrome as the browser.