I had a file set up with 6 masters (3 weights, 2 widths). I had a set of instances defined that showed and exported correctly. I added 3 more masters (an additional width), and the instances were all broken. Now, when I remove masters, back to only 6, instances are still broken. All my stem weight numbers are defined. Only a 4-master file will allow me to define and generate instances. I updated Glyphs yesterday; did something happen to Instances in this version?
NOTE: I am fully aware that it is not recommended to use more than 4 masters. But technically, is there a reason this can’t work?