I have had success using VLC Media Player (from VideoLAN project) on my MacMini (2012) to create music playlists on my Clip Sport. I never tried to export playlists from iTunes on my Mac (or PC).
Here is the web-link for the VLC software.
http://www.videolan.org/vlc/download-macosx.html
Here are some instructions how to use the VLC software to make playlists on the Clip Sport (and Clip Jam).
First, I use Finder to create subfolders on my Clip Sport (internal memory or external card) under Music. Then I copy my selected mp3 files from my Mac into the various Music subfolders on my Clip Sport
Then I use VLC Media Player to load the mp3 files on my Clip player into the VLC playlist window.
(Cannot combine internal memory and micro SD card sources in the same playlist.)
Then I use "Media -> Save Playlist to file -.> Save as “abc123.m3u” and save the new playlist in any one of the Music subfolders on my Clip player. Then I can use Music mode or Card mode on my Clip player to select the playlist and listen to music files across all the subfolders.
See this link for some helpful screen captures
