Did you rip the CDs using RealJukebox? If so, did you remember to turn off the encryption? The Rio Receiver can't play "protected" ripped tracks.
Failing that, try importing the files directly, rather than using the Rio Receiver's RJ importer. Go to C:\Program Files\Audio Receiver, and type "regsvr32 /u realprv.dll" (without the quote marks). It will stop importing files from the RJ database, and will, instead, use the settings in the file import dialog box.
Roger - not necessarily speaking for empeg
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roger