[ubuntu] cant click randomly help plz.

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http://ubuntuforums.org – alright this may seem very vague but i will try to explain as best as i can. Randomly i will find that i cant click on windows. it seems utterly random because i will be able to click on a window one minute and a few seconds later it wont let me click on it. sometimes i am able to click on buttons inside the window but it doesnt allow me to click on my right panel or drag the window. currently i have youtube in the other tab, and it allows me to click on the page and drag it around but it doesn't allow me to click on the video or anything in the video box. Another example is when i press the p (Hardware)