Mine just quit yesterday too! It worked fine yesterday and then when I tried to start it.. it finds no media..at all.
I had a ton of music on the internal card, and now I will reload some to the device by cable and see if that helps. If there's a metalayer bug or whatever the prior posters mentioned. How should we recover? Thanks.

Follow up: Loading some new music didn't make it rebuild the library, but I can play the media out of the file manager. Its just a hassle to go that way. Should we try a new media player?
I checked for updates over the application manager and got nothing.