Hey guys. I have a 16-master font file (currently with a single glyph, /E, for testing purposes). (If 16 masters sounds excessive, I’d love to hear suggestions for minimising the number of masters!). I have 4 axes; weight, contrast, slant and bell (see: bell bottom scripts, such as Brandyscript.)
My paths in the Glyphs Edit view appear to be compatible in every way. Path direction, shape order, number and type of nodes, etc. All instances/interpolations work correctly in the Instance Preview window in Glyphs. The issue arises in Illustrator (and AxisPraxis etc. Anywhere after the font is exported).
Any slider combinations when sticking to Weight:  (Thin) work well. However, the closer I get to Weight:  (Black), the more jumbled the paths become (as shown below):
When turning on “Show Master Compatibility”, you can see that some path segments get highlighted yellow, whilst some are green (I recorded a quick screen recording to demonstrate). I have meticulously ensured that everything is compatible, so I’m not sure what else to do, or how to know what Glyphs is telling me with the yellow paths.
Screen recording: https://www.dropbox.com/s/jxgk41z1y6pbyu2/compat%20issue.mov?dl=0
Any suggestions? Thanks
Here is my .glyphs file: Funkford-v0-131.glyphs.zip (8.7 KB)