Safari won't display "On Demand" video

Since an upgrade back in November last year I have lost the ability to watch "On Demand" programming from our local (NZ) TV stations. You Tube also disappeared for a while but is back now since Google changed things. I had hoped that subsequent updates would reurn my service but it hasn't. I am etting tired of having to change to "Firefox" in order to catch up with my entertainment.

Any good ideas as to why this has happened and how to reverse it?

Thanks