Serious bug here: I’m unable to export any font both in Glyphs 2 and Glyphs 3. It starts exporting and then it keeps the wheel rolling forever (I’ve waited 5 mins for a typeface with 1 Master and 1 instance: nothing 
)
I’m on Big Sur with the latest versions of both apps.
Heelp 
Can you please send me the .glyphs file to support (at) (this website without www). I will have a look.
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Sent, thanks!
It seems that the gravecomb glyph contains a reference to itself. And Glyphs doesn’t catch that and gets into a loop. I’ll fix it. But you should remove that component.
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That did the trick, thanks to both of you for the fast reply! 