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In a .net CMS environment (Hubspot) using Fancybox 1.3.1, jQuery 1.4.2 and a Youtube iframe - FF in Windows 7 will not play videos. FF mac does. What gives?

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http://www.myTMCapp.com/, then click the "Watch Video" button. Works in Mac FF, Safari, Chrome and Opera as well as PC Chrome, IE 8, 9 but not in FF. Also won't play video if I make a page and embed the video there: http://www.myTMCapp.com/learn/

http://www.myTMCapp.com/, then click the "Watch Video" button. Works in Mac FF, Safari, Chrome and Opera as well as PC Chrome, IE 8, 9 but not in FF. Also won't play video if I make a page and embed the video there: http://www.myTMCapp.com/learn/

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There are some compatibility issues between the latest Flash player and some Firefox add-ons or settings. Could you see whether anything in this article helps: Flash 11.3 doesn't load video in Firefox.