Apple has released an iTunes update to fix a bug that prevented users from making ringtones out of iTunes Plus songs.
Version 7.4.2 of the music jukebox application "addresses an issue with creating ringtones using iTunes Plus song purchases", according to the release notes provided by Apple. The update also features other unspecified bug fixes aimed at improving stability and performance.
iTunes Plus songs are tracks offered at the iTunes Store that don't feature digital-rights management protection; the tracks also encoded at a higher bit rate than the typical downloads offered via iTunes. EMI became the first record label to offer DRM-free iTunes Plus downloads back in May.
However, Mac users who tried to use the custom ringtone maker added in iTunes 7.4 earlier this month had experienced problems converting iTunes Plus tracks into ringtones. Typically, an error message reading "Could not create ringtone. An unknown error occurred (-42160)." would appear. iTunes 7.4.2 promises to eliminate that error.
iTunes Plus review