Hi @comym
as I wrote, I have no problem with High Sierra, all versions and Overbridge (or the Virus TI, which has also a tight integration of audio with DAWs). Changing my laptop, the devices were no longer recognised by the Mac OS. Because of the tight integration with the OS, so it seems, there are checks and drivers may be blocked in the same way the installation of new software requires the user to allow the process to move on. If you go the Apple logo on the top left, then Systems Preferences, then Security & Privacy, one may find a message there that something is being blocked. Now, I did not see anything there when I got a hint that I should look there. However, when I rebooted the laptop and had the Security & Privacy open, something popped up. Unchecking this, just like if there was some software installation, all was fine again. So, in case all other USB devices (e.g Octatrack) work fine but only the Overbridge devices are not recognised at all, this may be happening. Worth to check out.
I cannot claim to be the most happy Apple customer and my gut feeling is that over recent years thing become less smooth. But in my case, the problem is neither a negative thing about the OS, or Overbridge. What Access and Elektron do with the Virus and Overbridge is quite sophisticated, providing a deep integration. One should not expect this to be perfect (although for me the entire experience is really smooth and actually perfect so far). I am however not making myself and my fun dependent on things like Overbridge. It is a fantastic add-on, helping me to transfer music sketched in the DAW to my hardware and I also use it to check the spectra of sounds on the machines in the DAW. Sound design is also a pleasure with Overbridge and the A4s … but after a while it again is also no problem without. For me, Overbridge is an icing on the cake, but not deal breaker.
Switching from the MKI’s to the MKII’s I realised that it would be nice to have a different kind of “total recall” or “migration assistant” in Apple speak. Some easy to use, “few clicks” backup and restore of projects would be nice 