On some sites flash won't play, Adobe TV being one of them. Youtube and many others are fine.
I have tried Firefox, Safari and Chrome (all latest versions) on OS X Snow Leopard. I have installed removed and reinstalled the latest Flash. I have even physically removed the Quicktime plugin (from the library/internet plugins) and the Quicktime application (from applications).
So now I am totally lost here. Please help.
I was having the same problem with trying to play the Actionscript video tutorials at Adobe.dougwinnie.com and so I had to go to the following website address http://get.adobe.com/flashplayer/ to download and install Adobe Flash Player 10.1.102.64
The videos at AdobeTV now work just fine when I watch them in Internet Explorer 7
I hope this will work for you also. Otherwise you may have to contact someone at Adobe technical support to get help.