Incidentally, when there's a list of radio stations displayed and then a search comes up with no stations, the list viewer still shows the stations from the previous search. If I try to click on a station or scroll the list it goes blank, so it looks like the list is in fact empty, but the list viewer didn't refresh to show it as empty. That may well be a list viewer bug and not a problem with MediaVault, but maybe there's some way to force the list to refresh.