USA Today reports that early customers have found they can’t transfer purchased tracks to their portable digital music players. “The Mac-only iTunes has won raves for ease of use, both in burning CDs and transferring songs to Apple’s iPod players. But BuyMusic’s tracks have started out as unplayable, even on portables lent to the press in a promotional blitz,” notes the publication. “We’re working on this,” said CEO Scott Blum, who says the company will have the glitch fixed today and that customers who have bought tracks will receive free re-downloads. USA Today also notes that BuyMusic will not release its first week’s download figures, but “it’s not millions,” Blum said. As you may recall, the iTunes store sold over one million songs in its first week and 6.5 million since April. BuyMusic blocked access to the site for Macintosh users last Friday.