Video's won't go into full screen

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http://askubuntu.com – Whenever I try to play a video in full screen, it does nothing. I press the button, it flashes as if the video disappears, and then returns to how it was before. I have successfully gotten into full screen, but I do have to click the button a thousand times until it takes effect. And there is no surefire way that it will go into full screen, no matter how many times I click the button, it's generally random. I have tried this on multiple sites, and it is all the same. However, I have yet to try it on a video that is not on the internet. This is a new installation of Ubuntu, I have installed it (HowTos)