can't play flash video from one web site on IE10

I can generally read flash videos on many web sites, but since yesterday I can'y Watch the video on IE10 on these web sites :

http://lecontactboursier.com/articles/indices/6352-analyse-cac40-par-lcb-05-11-2014

or

Direct Auto - D8 - La nouvelle grande chaîne

I have no video displayed only a white rectangle with a sign on the left top corner as showed

But both work well on Google chrome

Can you help

I have Windows 8 64 bits

and the last flash player 15 installed