When I try to watch some videos on YouTube, I get the output of the following type:
The behavior persists regardless of the web browser. Is there a solution for this problem?
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Your problem seems like a more extreme version of the problem I had before.
As you said in your comments, you own a lenovo laptop, too. I assume you normaly update your drivers using the lenovo update tool. These drivers are mostly stable, but often not really up to date. I remember some time ago nVidia actually asked users to download the drivers for mobile solution from the laptop vendors site instead of their site. Whatever, this doesn't seem to be the case anymore, at least I have not found anything like that on their site.
So go to nvidia, download the latest drivers for your graphics card and install them. This should rid you off these green bars, somehow these seem to appear when using an older driver combined with the recent version of flash. Seems that the old drivers did not completely adopt some encoding standard.