Hi chony,
The current YEM version 2.8.1 is obviously not yet fully compatible with macOS 12 (Monterey). That is why the following note is also on the YEM download site:
*We are in the process of verifying compatibility with macOS Monterey (12).
We recommend that you refrain from updating to macOS Monterey until compatibility has been confirmed.
>>>
https://europe.yamaha.com/en/support/updates/yem_mac.htmlI am currently not working with Mac computers and unfortunately I have no indication at the moment whether there is a workaround to run YEM V2.8.1 with macOS 12 Monterey.
Best regards,
Chris