Problem copying mp3s to the Shaker

Hi all!

I have a problem with writing mp3’s to the Shaker.  When the card is inserted into the player it seems as though the SD card is write-protected.  I’ve tried moving the write-protect switch to the other position but it still doesn’t work - continues to say write protected.

I can copy files to the SD card when inserted into my computer’s memory card reader, however.

Thanks for any help!