When drag&dropping tracks from Rhythmbox to my SansaClip+ Rhythmbox auto-converts those tracks to MP3, even so they already are MP3s. It doesn't do that with all tracks, just some, and it seems rather random which one it converts and which it doesn't. It didn't do that prior to Ubuntu 11.10.
As far as I can tell the player and it's supported formats are properly detected:
model: Sansa_Clip+_4GB vendor: SanDisk filesystem uuid: 0123-4567 drive type: (none) requires eject: true access protocols: storage output formats: audio/mpeg audio/x-ms-wma audio/audible application/ogg audio/ogg audio/flac audio/x-wav audio/x-pn-audibleaudio input formats: audio/x-wav playlist formats: audio/x-mpegurl playlist path: audio folders: MUSIC/ PODCAST/ PODCASTS/ RECORD/FM/ RECORD/VOICE/ AUDIBLE/ AUDIOBOOKS/ folder depth: -1
Edit: I am starting to think that this might be a database issue, as I only have the problem when bulk copying old podcasts over to the player, so far I don't think I have had the problem with podcasts downloaded with the latest version of Rhythmbox. However just a hunch for now, I might be wrong.