I'm glad you got your programme to play but the solution I gave you shouldn't be necessary. What I did was to get to the BBC Radio Player and follow your link to the Blueroom. I then clicked on the button to listen to the programme and when the 'Playing Now' sign appeared I placed the mouse cursor over that box and did a right-click. I then chose properties and it gave me the URL of the programme. Highlight, copy and then paste.

Having said that I believe the problem must lie with the Real Player settings somewhere. It seems to be having a problem with streaming. Have a look through to see if you can see anything. Unfortunately I don't have Real installed so I can't go much further. Perhaps somebody else on the forum might be able to help.