It's a Flash's bug. The problem occurs on the Flash 11.2 with libvdpau, but the bug is not in libvdpau. There are some reports in Adobe Bugzilla, but Adobe didn't anything to solve.
Workarounds:
1. Open the console:
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su
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nano /etc/adobe/mms.cfg
Add this line:
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EnableLinuxHWVideoDecode=1
Problems with this workaround: Flash sometimes crashes. Problems with leaking overlays.
2. Go to the YouTube video, click with the right button on the video, Advanced Settings and uncheck "Enable Hardware Acceleration". Restart the browser:
Problems: low performance, specially on full screen.
3. Enable HTML5. Go to
http://www.youtube.com/html5Problems: HTML5 doesn't work with playlists and videos with announcements.
4. Use Flash 10.3
http://www.adobe.com/products/flashplay ... tion3.htmlProblems: it's not oficially supported by Sabayon. Maybe it won't work.
libvdpau 0.5 contains a fix for this. But this version is not in Sabayon yet (but it's coming soon).