After a few days away I started up the hifi tonight. US took ages to start with logo constantly flashing.
After turning the power off on the 3rd attempt it started after about 15 mins. All the albums are still there but the playlists are gone!
I will add that the playlists were created using the nServe on the iPad and I believe that it's best to create playlists using the DTC, is that correct and is the above behaviour indicative of a problem that is likely to return and signs of a bigger problem lurking ?