Spotted another problem in build 67:
Replay Gain isn't being applied.
Under "Set Upload Volume Adjustment" in MC, I have Apply Replay Gain ticked with an additional adjustment of +24db (the highest it will go, on the left-hand side of the dialogue box).
Neither of these are being applied - ie the songs are playing at different levels, and they're all too quiet. This worked fine in build 60 and earlier (the old iPod code).
Additionally, I'm still not seeing any playlists but should have repeated my stats: I'm uploading 4400 files for a total of 27.8 GB, which pretty much fills my iPod, leaving 142.8MB free. I have about eight Smartlists (one of which contains all those 4400 files, a couple of which are about half that size, and the rest of which are tiny) and a single Playlist, none of which are being transferred across. Using build 60 and earlier, I've successfully transferred MORE songs across leaving LESS space on the iPod, so I'm not convinced it's a space issue, especially as 142MB seems quite a chunk to hold a handful of playlists. Anyway, there you go.