The error msg I get is "CD drive check has failed". I cannot play CDs there either, not that I do constantly but it's worth mentioning. It seems there is no communication between the CD drive and the Minidisc drive.
When I fire up Simple Burner, the CD gets tagged via CDDB, but whenever I try to copy it to the MD unit vía the REC button, seems like the program doesn't even try, blinks and shows the error. CD Drive check, within CONFIG, also fails with the same error.
Two thing I love from MD that MP3 have never managed to come close to are the gapless feature (great for concerts) and the superior ATRAC codec (superior to MP3 at least).