Found this posted on another thread by letheaqua which solved my problem: "A youtube or Firefox bug. Delete all cookies from youtube cookies first > open firefox tools> options> privacy> firefox will: choose in drop down box:use custom settings for history> show cookies> delete youtube cookies in box:accept cookies from sites> choose exceptions> add:http://www.youtube.com> click ok at bottom. Firefox will no longer accept cookies from youtube. This is a temporary until bug is fixed" Thanks to the original poster :-)