Hi @Electric_partner5FAC,
Thank you for reporting this issue. We are also able to reproduce it on our side and have opened a ticket to investigate along with the team at BorisFX.
In our testing, only the Cmd/Ctrl+A shortcut appears to cause Mocha to close. The X, Z, Q, W, and E hotkeys all appear to work as expected. Does that match what you are seeing as well?
Thanks again for reporting this issue,
- John, After Effects Engineering Team