i have the exact same problem...
I was able to use Yahoo's online radio in which you were able to create your own radio staion based on your music preferences and how you rate songs. I was able to use this at my high school, but I am now on my home computer and one part of "Launchcast" has trouble loading. I am able to open the seperate browser fine, and have no pop-up blocker problems. My problem lies within the player itself. The serperate browser launches and does its little intro and then I am able to pause and skip songs at the bottom, control the volume, and see how far along i am into a certain song. Above these there is a black box in which you should be able to see the song and rate it. My problem is i always get the beginning thing where it shows in "tuning". Is there anyway i can fix this?
P.S. And yes i have already exhausted all of yahoos help tips

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic