I haven't been able to duplicate any problem like that. Just generated a bunch of songs, with RealTracks on Strings (and Melody and Soloist). Please let me know if there's a way to duplicate it.
For example, if you boot the program (or choose File-New), add a RealTracks to the string channel, and press PLAY, does the issue happen?


Have Fun!
Peter Gannon
PG Music Inc.