I should point out too. There's a nifty Greasemonkey script called YousableTubeFix on Userscripts.org that disables the Buffer limit on the YouTube player. I find that to be very helpful especially when speed is an issue.
Can you clarify where that setting is in Yousable Youtube Fix, Im in settings and only see something to stop autobuffering.
Good 'ol slowtube. I've also been noticing buffering issues more often lately. Definitely a slowtube problem though.
Its a real annoyance but the only one I have with FIOS, funny thing is it never did it when I was on optimum but I had constant connection problems with OOL so go figure.