So I actually figured out the problem. It was a zscript that no longer works because of the new user data location.
In case this helps someone else I will explain the exact issue here. Basically ZPUBLIC_ is something you can use in a zscript to get the user data path. On windows this used to be in:
users\public\documents\ZBrushData
but since 2026.1 it has been moved to:
users*user_name*\AppData\Roaming\Maxon\Maxon Zbrush
ZPUBLIC_ now points to this new directory.
In cases where the script is just accessing files and folders in the user directory this will actually mean old scripts should continue working as intended.
But the GoB script was accessing this directory as starting point and then going back up the folder structure in order to access the users\public\pixologic folder where most of the GoZ folders were and still are. So this change to the location broke all that.
I have made a fork of the GoB addon with a test fix, if you try it please let me know if it works. It should also work for Mac but I don’t have a way to test.