Did anyone ever respond to your question? I have the exact same problem. I.e., I can log into the xbox but every drive shows up as empty (0 kb). When I click on a folder/drive, I get either nothing or an error message (depending on the drive).
I know some people ftp to their xbox via OS X. What am I doing wrong?
I have a quite new XBMC, and I can access it perfectly from Windows with FileZilla, and from Mac OSX with Transmit, all in passive mode, however, using the latest CyberDuck (2.5.5) it is really slow, it does work, but listing take way too long compare to other program, and render CyberDuck quite unstable when it's trying.
The Mac OSX command line seems to work fine with XBMC, and CyberDuck works fine with other FTP, so it is really a problem of XBMC+CyberDuck on those particular versions I use (it used to work on my iBook).