Originally Posted by MarioD
Since you have been using BiaB for 30 years I'm going to assume you are using a PC, correct?
Have you tried using the method in the microchord window? Does it work?
Maybe you could upload the song to the free Dropbox and post the URL so we can take a look at it?
Also the more information we have about your system will help tremendously. Things like CPU speed, HD or SSD, ram, free space on the HD/SSD, etc would be very helpful because at this point it sounds like the problem is with your system; it might not be but without more info we all would still be working in the dark.
Also have you run a full anti-virus scan? Have you used Ccleaner or Anti-Malwarebytes?

The reason I ask is because copy and paste in 4/4 or 3/4 works perfectly on mine and Audio Tracks machines.

Could others please check it out? It would be interesting to see if anyone else is having this problem or not. Thanx.

Thanks again Mario for helping.

Yes I use a PC.
I just tried the MicroChord Window method. It failed. frown

Pentium Celeron J4105
RAM: 16 G (15.7 G usable currently)
64-bit
Windows 10
SSD: 157 G free space.

I have uploaded the test file to Dropbox for you to test out.
BIAB test link Here is the link.

Of note:
Bar 5 only Bass does micro! But adds a fifth note (C) !
Bars 13, 14 is where I copied micro to. There are No Vibes there now!
Bar 18 N/C.
I froze the tracks so you could hear exactly what I heard.
The tracks were not frozen while I was working with them.

A BIAB user for more than 30 years (if you can believe it) !