Hello
Ooophs! Sorry that I forgot to inform you of the current solution.
You can change the short cut in your system preferences, and if you change it in that to other shortcuts, things will work. We have tested several machines, but was not able to replicate the issue.
Also, you could go to MarginNote, and select services, then go to services preferences to see if there is any shortcut conflicts. It may not work, but there is a chance that something happen there.
Sorry again about the inconvenience. Have a nice day:-)
Kind Regards,
MarginNote-Sushi
Support Team