Yes, Craig, thanks. If I can ever get this current project to the mastering engineer, I will be willing to start fresh.
One issue is hard disk space. I have a 1 TB SSD for orchestral samples and a second spinning drive for projects as soon as I can stop.
Catch-22: a rather full disk is probably making things worse but these weird issues force me to keep saving versions which in turn eats up disk space. GRR.
Believe me, I am not angry at Cakewalk or Sonar. I think I had a flawed installation from Day 1, something I won't get into here.