You need to play around with your realplayer settings
options > settings
Access point in use.
Mine will only play using either wlan or wap connection settings
If i use contract internet settings then the page will show but the programme will not play.
Best thing to do is set up your access point in your web browser settings to always ask. That way you can choose the connection in relation to the app being used. Its a pain in the arse but different apps require different connections and the phone isn't as yet, clever enough to bind a connection to an application.