It sounds like you need to click the Sync button if you are on a Mac that is the only way to do it. It comes up when you open PlusSpec on the splash screen & it is in the main PLusSpec tool bar at the top.
What size are you trying to create? I assume it is France
Here is a video that will help. youtu.be/0bBvAYWXfIo
There are a heap of videos on youtube, Type in “create material PlusSpec” I hope it helps.
I have the same issue. For a 99$/month plugin I’d expect bugs like this to be fixed 2 years from when they were first reported…
Anybody got a fix? I already tried making my own materials/syncing/rebooting…
Bug appeared after finishing interactive tutorial.