I'm sure you know this already, but just in case -- you know that if you're playing the SACD layer, it'll shut off the digital out, right? You need to be playing the CD/redbook layer. I'm sure you're already doing this, but it's the only thing I can think of. Have you hooked it up to a display and gone through the configuration? I'm not that familiar with the Oppo's, yet -- is it fairly easy to toggle back and forth between the two (or three) layers, just via the remote? Actually, I'm basing my opinion on my SACDMods.com-modded Denon player, with which I'm quite happy. But yeah, based on others' experiences, I wouldn't rule out Reference Audio Mods or ModWright or maybe APL (getting to be out of my price range with that one).
And thanks for the info on the transport, I'll search the archives.