To those folks who tried to help and thinking of helping.
Kindly put your troubleshooting energy on hold. I think I might be on the right path. Seems it is related to how and which styles are saved in VArranger and conversion to MIDI files. I got some arrangements to work nicely in BIAB just now. I will experiment in the next 2-3 days and will report back if I solved this or not.
In any case, thank you! I am grateful to know there are people here who are willing to help.
Misha.