Sorry I didn't see this sooner! Sending us email
or submitting a github issue against our LinkBack code
would probably get our attention more quickly.
We're continuing to use LinkBack in our sandboxed apps.
For now, we're just using a temporary entitlement to look up Mach ports in known apps so that this works with existing code:
<!-- LinkBack needs to be able to talk to mach ports for other apps that use it -->
Looking ahead, we should probably replace named Mach ports with local sockets and Bonjour lookups, but that change will require coordination among all the apps which support LinkBack.