I just spent 4500 lindens on one of their dance huds, and it worked for just a couple days before going down....
I am in the same boat as you. I can not bring up the dialogue box to select a playlist, nor can I get their website to load. And the website has been down for many days now.
I too would like some sort of explanation...their in world store still seems to be running and busy, they should not be allowed to contiune to profit on peddling broken merchandise.