I have just upgraded Roon from 323 to 334 up a MacBook running the latest beta of Mojave (18A314h) and it now refuses to load.
It bombs out with a ‘Roon quit unexpectedly’ error. I know that this is a beta OS but thought you might still like to know as I guess you will be supporting it fully once released.
If you send me a link I can upload the error log if interested.