PMS not working on two OS X laptops after update

Ok, scratch that. Managed to get it working, thanks to the solution posted in this thread: PMS 1.14.0.5470 Crashing on start on Mojave Apparently the problem arrises when there are multiple IP’s on the loopback interface, and removing the additional loopback IP’s fixed the issue. In my case, it would appear that the additional IP’s were added by OpenVPN, but your case may be different.