I obviously can't split the (refs = 0) search...

Splitting the other one may have turned up something useful - all the items I've set options on are playlists, and none of the searches have returned any playlists, only tunes. Perhaps this is where the problem lies? Version 42 returned both tunes and playlists, unless you explicitly selected one or the other using (type = "tune") or similar.
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Toby Speight
030103016 (80GB Mk2a, blue)
030102806 (0GB Mk2a, blue)