Unable to reproduce your trouble tested in 3 different computers up to date OS , drivers etc, no any one show the issue.
In only one computer I can reproduce the issue, but after update video card the problem disappear.
All test conducted with cantabile installed and empty duet no idea what you load inside and I not have the same setup you have.
If you fix with autohotkey, then probably is the solution for you, until I cant reproduce the bug there is no way I can fix a trouble I cant reproduce.
Are you tested with cantabile empty?
Please confirm.