Problem viewing online videos

I have a problem using the online video viewing feature, the first time I tried to saw a video online , it buffered alright and I could see it complet. But now it buffers and it appears as fully downloaded but I can't see it.
Thanks for you time , sorry for the trouble. :(

of course my horse!

do you actually have the codec needed to view it?

I have everything I need to view it , and I know it because I alredy view it . And yes if I use an other browser I can see the video , but then that browser suffers the same problem than the first one.