Hi rayc!
Many thanks for getting back!
With apologies for the extended Post!
Yes, there appears to be a 2 Bar Intro/Wait from when I start "play" in the DAW then, any Audio input from the DAW (Studio One 6) starts at Bar 3 on the BIAB chord Sheet, with no relationship to the Bar Number of the Song.
Studio One 6 can identify the Chords on any selected track and puts them up into the Chord Track.
Because the two Bar Numberings are different, it makes it a little difficult to read the DAW Chords and enter them into the BIAB Chord Sheet.

On a separate but associated problem.
I have created a MIDI Track File (Using Melodyne) to make use of the "Load Chords from MIDI File) from the "File" Button but, there are no other steps available (as far as I can see) and Drag and Drop doesn't produce any results except that the Chord Sheet pop up message says, "Drag and Drop".
This facility would be of huge assistance in cutting down production time!