Can you please try running the "Stand-alone" version of the DAW plugin. This is located in Band-in-a-Box/BBPlugin/Files/

Just is just like running the plugin version but outside of the DAW and is useful for troubleshooting.

A. You should be able to copy and paste chords in the chordsheet. The commands are the regular command+C and command+V hotkeys. There isn't a right-click context menu. If this does not work at all (highlight chords, command+C, then command+V), it is possible that this is a OS 10.10 specific problem, although that seems unlikely and I have confirmed that it does work in OS 10.11.

B. With muting tracks, you need to remember that if you are playing the "Master" track, you can't mute individual tracks, because the "Master" track is essentially a single rendered audio file containing all tracks. If you want to play multiple tracks and have the ability to mute them, then you can select (by shift+clicking or command+clicking) the tracks of interest, then press the Play button. You will then be able to mute individual tracks. Within a DAW, rather than muting you can usually just double-click the track icon.

Andrew
PG Music Inc.