I’ve got similar problem as dadastudio’s but with 2 masters: light and regular.
When I’m starting to interpolate within “regular” master, it’s starting to make unforeseen changes ( for example smart component is using as a master “light” version instead regulat).
Smart components Settings interpolate through all masters, so you do not need to redraw all your smart glyphs on all your masters, but just draw master ‘bold’ as an additional smart layer & add the property ‘weight’, and assign it to all smart layers. This is new in 2.0.1 and multiple master is not covered by the tutorial.
I changed it already to not use all masters as long as you don’t add a ‘Weight’ parameter. It only responded to that particular name, so if you need a weight axis but don’t like to include all masters, just pick a different name.