Embedded videos not functioning in Safari

Embedded videos are not functioning on Safari 6.0 on my retina MacBook Pro. Only YouTube videos are working, whereas most other sites like Guardian.co.uk are not working. I have to load up Firefox, which looks pretty horrible on the retina display, it must be said. Anyone else experiencing the same issue? Any proposed fixes? My Adobe Flash is all updated.

 

Thanks for the replies. Im still having the same issue. For instance, the video in this MacRumors story does not appear. Such is the case for almost all embedded video (e.g The Guardian, Engadget, etc).

http://www.macrumors.com/2012/09/12/iphone-5-photos-and-hands-on-impressions/

@ericmooreart: Strangely enough, your embedded video is one of the only ones that DOES work!

 

Thanks for all your input. In response to "Sital", turning 'Adblock' and 'Ghostery' off worked out well for me. However, I don't understand how the same settings on Safari and Firefox have such different results. I have these extensions installed in Firefox as well and videos load just fine. For example, this embedded video works in Firefox, but not Safari with the same extensions:

http://www.guardian.co.uk/film/video/2012/oct/08/skyfall-adele-bond-theme-video

However, this is obviously an issue with extensions themselves and their interaction with Safari. I've added Guardian to the 'safe list' for both extensions and video is loading just fine. It's just a shame I cannot avoid the annoying analytics companies leeching my usage data. Thanks again!