I've been playing YouTube videos on Internet Explorer 10 without a problem but today I suddenly cannot play any video higher than 360p. All I get is a black oblong box with no loading wheel or player controls. When I right click it says "movie not loaded". My Flash Player is version 11,9,900,117. I can still play 720p on Firefox or Chrome, although they do not seem as smooth as they used to (but that may just be my imagination).
Any ideas why and what I can do? All the research suggests it could be Flash Player but I appreciate this problem may not be directly Flash Player (I'm trying all the various forums to try and identify where the problem is).