This module uses the MgMediaBot mambot. That mambot uses a Flash MP3 Player and this player will block on some case.
If you have a play list that contains files with non alphanumeral characters, the player may only play the firsts files that do not contain thoses character.

To avoid this, try to name your MP3 files with only non accented letters and numbers. Or at least avoid these:
' (single quote), & (and), " (double quote), ; (comma)
well in fact any punctuation

Well the original mambot contained an old dewplayer.swf file that does not support autoreplay. I've downloade the new version from Dew's website and replaced it in my package.
You should redownload it, uninstall the old one and reinstall.

If any bug, please report.
Thnx to Harry for this report.