MIDI TRACKS CHANGING CHANNEL ASSIGNMENTS

Greeting!
 
Since a Windows 10 Update back this spring, I have had a problem with the MIDI assignments changing on my instrument tracks when I reopen a project.
 
Example:  On one project the first MIDI/INSTRUMENT combination I opened was Addictive Drums.  Later in the project, and many tracks later, I opened SI-Bass.  After saving the project and returning the SI-Bass MIDI channel was outputting to Addictive Drums.  In the project there were SEVERAL other MIDI/INSTRUMENT tracks that were pointing to instruments other than they were originally assigned to, and it took a few extra, non-productive minutes to get them all corrected.  
 
After saving and opening the project on my next work day, the assignments were wrong again.  This is now occurring when I open any existing project that has MIDI/INSTRUMENT tracks.  
 
I also tried creating SIMPLE INSTRUMENT Tracks and the same thing happened.  I had to go back and split them to MIDID+Instrument  tracks.  This DID NOT ultimately correct the problem either.  
 
Not sure what to do next.   Let me know what you can. 
 
CAKEWALK REF#  344199.