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I am using Ubuntu 10.10. I tried Firefox 3.6.10 and Chrome 10.0.648.133. In both the browsers, I am able to view flash videos in Youtube and Facebook. But when I switch to full-screen, the flash player plugin crashes.

Is there a way to fix the problem?

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It's extremely hard to tell you without having knowledge of your upgrade path, the version of Flash, and/or your video card and drivers. That being said, you may want to check out these links:

I found this on the Ubuntu forum that you can try:

sudo su
mkdir /etc/adobe
echo \"OverrideGPUValidation = 1\" >> /etc/adobe/mms.cfg

If none of these work for you at all, consider reporting a bug to Adobe:

You may also want to submit a bug report (if there isn't one already) to the Ubuntu Devs:

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