If I have a class
MyClass

That is already linked to an instance in say MyViewport

MyViewport
myclass
Then I add a custom config property to MyClass.
The new custom config property is not available in the property list of the linked instance myclass.

Workaround is to delete the linked instance and recreate it - works perfectly.

Just a small bug really - the rest of Architect is really great to work with and has saved me a load of time already - thank you!