Sept. 25 2019:
There was a problem when stem-tracks were used - those tracks would unintendedly be copied to the backtracks, which is now prevented.
Enhanced validation when marking tracks: If a track contains a subproject, it can not be copied to other projects - an error message explains this restriction when the user tries to do so.
Cosmetics: Text in confirmation messages were partially unclear and inconsistent.
Bugfix: Tracks under *MIX could not be added to backtracks.
Bugfix: Copy command in Windows does not work when using hidden directories, which is why the "#SYNC"-directories can not be hidden.