Good point Noel, many thanks.
I was presuming that the bar(s) were selected using the standard computer method used for selecting most objects, like holding the <shift> key pressed while clicking on the required bar(s), or with the <shift> key pressed, using the keyboard cursor arrow keys to select them, then pressing Control-C to make the actual copy of the selected objects.
Perhaps BIABman was not selecting bars that way at all?
I'm only guessing, Trev. But since I was able to reproduce BIABman's results doing it that way, it seems like a possibility.
It's interesting because selecting something by simply clicking on it is like clicking on a word in an MS Word document and to select it. This doesn't work and it's necessary to select the whole word in some way. That said, in MS Excel, the contents of a cell can be copied by simply clicking on a cell (and using CTRL+C/V). The underlying structure of the original BIAB chordsheet seems to resemble a spreadsheet's cell rather than the text in a document file. I'm guessing that the microchord addition to the chordsheet is more akin to a document overlay on the original spreadsheet-like base.