YouTube loads black screen for first five seconds

Starting early January 2013 in Firefox, YouTube videos are loaded as blank black screens for the first five seconds. At the 0:06 mark, videos start playing normally. This is not an issue in Chrome or IE. Tested with all plug-ins and add-ons disabled (except Flash player). Plug-ins/add-ons updated. Tried re-installing Firefox with no solution. Help? Thanks!

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