I have had the same problem as Benny. BIAB 2011 Build 26.

Jukebox is selected Checked boxes for -
include songs without melodies,
audible lead in,
vary melody instrument,
random play
Auto--choose soloists
Change soloists w/each chorus

I believe these are defaults as I don't remember altering settings in jukebox.

About the third song in jukebox play gets all jumbled up with strange, drums, and chords.

It lasts for about +-45 seconds then resumes normal play.
Seems to happen on 2nd chorus.

It has happened at 4 times with new version BIAB, that being said I have not used jukebox much
so it may be more of a problem than I realize.

After running into the problem a few minutes ago, I restarted BIAB selected jukebox and it played
fine for at least 20 minutes. Go figure.