Rhythmbox 3.4 is out, and you should upgrade.
Plenty of reasons, but one matters more than the rest: it fixes the memory leak…
Before, listening for too long would blow up memory usage. Not anymore — at least I haven’t hit it since upgrading.
Got the Sony ZX1 fixed, so naturally it came back empty and I started loading songs onto it. I used to naively assume Linux just couldn’t handle a Walkman, but then I thought about it — it’s a USB mass storage device, why wouldn’t it work? Reality, of course, was harsh: plugging it in didn’t get it recognized the way my flashed iPod did. So I poked around and found the method is stupidly simple.
Create a file called .is_audio_player in the root of the Walkman. Contents as follows