First, best wishes to all in 2016 !!! (my first post this year)
Just ran into this issue this morning, while listening to my project from yesterday… One instrument channel (Padshop Pro) will not play anymore in the mix. Only when soloed, the channel will play. I also found out that Solo Defeat lets the channel play in the mix again, I just never use this function and I am not sure if this is intended behavior.
Any advise from you guys?