I think this is due to the time required to generate RT's. You didn't say if these existing songs have some RT's already in them or if they're all midi. If they're all midi then this answer has no bearing on the problem. Biab has not finished generating the Real Tracks/Drums for one song before you go on to another. I don't use the Jukebox so I'm not positive about that but it sounds like it. Biab will allow a song with RT/RD's to start playing before the song has finished generating. If you stop the song before that happens and either hit play again or start a new song immediately it hangs and since the Jukebox just runs from one song to another the generation time could be the culprit and that of course is a function of how fast (or slow) your computer is. Normally, people use the Jukebox to play the whole song and even on a slow computer Biab will have finished generating after the song has played 8 or 12 bars or so. Try extending the number of bars per song to say 15 or 20 and see if that fixes it.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.