Shortcuts

[James Linder]

Hi all
I can find no reports relating, so I wonder if I’m doing something amis:
I have an app built with qt5 from macports.
I set a menu shortcut to Return

If I build it in sierra then in both sierra and high sierra the shortcut 
works
If I build it in high sierra then the Return shortcut does not work but 
others eg option D
do work.
the menu does show the shortcuts eg both option-D and Return.

Has anybody bumped into this issue or indeed is using Return shortcut.

James