I seem to have exactly the same problem. I'm also using hardy.
After logging off and back on, it worked again.
Could someone tell me what to do to add more information to the bug-report?
** Changed in: rhythmbox (Ubuntu)
Status: Invalid => New
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Music files will not play (rythmbox, totem, file system, etc.)
https://bugs.launchpad.net/bugs/225511
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