Same thing happening to me with live Youtube streams (noticed that yesterday during Falcon9 launch, confirmed today while trying to watch 24Hrs of Nurburgring). Either 3 seconds stutter for a few times and then I'm launched back to the YT plugin main screen or it gets stuck on "Buffering 0%" (sometimes "21%"). This is a log from a "0%" occurence:
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I have no problems with non-live videos, can stream simultaneously 50 or 70 in HD on my 1Gbps connection. Live doesn't work though.
(first post, so hello all)