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Oooh fun, I’ll pop in there for a chat, thanks for letting me know!

And dang, that’s a real hassle. I have a patch coming up and I’ll try to make sure the signing is fixed for that one. It’s so hard to tell when it will or won’t work. GameMaker and Mac don’t seem to be friends.

I don't think it has anything to do with signing. the error message seems to be from the framework you're using, not Apple: