Hi, thanks for the reply. Regarding WMP, I'm only trying it with about 4 tracks on the LS at the moment for exactly that reason :) Still no joy, though.
I didn't realise it wasn't DLNA certified - it used to stream from my old Lacie ethernet disk mini absolutely perfectly, so I assumed it would work with the Buffalo NAS, too. The Lacie was the noisiest, flakiest NAS I've ever known, though, hence why I splashed out on a new, quiet, reliable Buffalo, and why I'm so gutted that it doesn't actually do what I bought it for. If you do have any other suggestions, please do let me know.
Cheers,
Ben