I originally reported this into Adobe bugbase
, but given the lack of progress I have decided to give it a shot here.
Basically, when vdpau is enabled for Flash Player (by setting EnableLinuxHWVideoDecode=1 in /etc/adobe/mms.cfg), whenever the progress bar of the youtube player is clicked, the video would stop refreshing while the sound would keep playing. I did this particular test with Flash Player 188.8.131.52 and nvidia 290.10 driver on Fedora 16 x86_64. Required files are attached, please let me know if more is needed.
Video tested: http://www.youtube.com/watch?v=NxLu2kafAIY