Jimbo 88
Did you try freezing Massive before the bounce?
 
...or how 'bout bounce the Massive track starting after the tempo change.  I know I have timing issues with some soft synths and tempo changes.
 
As usual, your music sound great!

I try to avoid bouncing when working with only MIDI instruments and software synths.   I have a workaround now that requires a bit more planning when it comes to tempi, but that's the way it is. 
 
Glad you liked the piece.  The version I posted is not the final one, the audio dynamics and EQ are not at a performance level yet.
 

jsg
Some softsynths that sync to tempo don't respond well to tempo changes, particularly the ones that have rhythmic oscillations and have crisp attacks.  I resolved it by moving some tempo changes a measure before the synth comes in and this solution works.

I do not use synths which have seen this, but have seen posts where tempo changes need to be inserted far enough ahead of the note on message to "take." It may be something in the algorithm of the tempo sync with that VSTi, but I was led to believe that it only requires enough samples (not sure the "minimum" though) for the sync rather than a whole measure.

mettelus

jsg
Some softsynths that sync to tempo don't respond well to tempo changes, particularly the ones that have rhythmic oscillations and have crisp attacks.  I resolved it by moving some tempo changes a measure before the synth comes in and this solution works.

I do not use synths which have seen this, but have seen posts where tempo changes need to be inserted far enough ahead of the note on message to "take." It may be something in the algorithm of the tempo sync with that VSTi, but I was led to believe that it only requires enough samples (not sure the "minimum" though) for the sync rather than a whole measure.

You may be right, I am not exactly how long a lead time the VST synths need to stay with a tempo change, probably less than a measure.  But one synth, the Z3Ta 2.2, needs more than that.  It probably varies from synth to synth.