Ok. So, I got it to work. Not exactly sure if I figured what the issue was, though.
Not mentioned in the OP but, I also had a multi out instance of Trilian frozen before freezing the two Massive ones. So I attempted a "bounce to tracks" for the Trilian synth, and had the same problem as above.
Unlike yesterday, when I hit undo or unfroze the synth everything would play normal without "glitches", this time those Kontakt tracks would continue to glitch out. Also, after stopping transport the strange "effects" would continue, intermittently.
What I ended up doing that worked for was, after each performed "freeze" and/or "bounce to tracks" of the two synths (followed by their deletion); I would save a new version of the project, without pressing play on the transport to hear the result. At the end, I had the bounced audio on new tracks and presto! Everything played without a hitch!
The problem is... Is that I don't know what the problem is that caused the issue.
Could it be an issue with my system, soundcard (M-audio fw 410) and it's driver, or Sonar itself?
It may be something I'm overlooking since I compose only as a hobby, am new to Sonar and relatively new to computer music. However, the only problems I had with using the freeze and functions before, was when I didn't know how to do it correctly (and maybe that's still the case
).
Anyway, just thought I'd pick your brains for some insight while sharing my workaround.
Peace