Holy cats, I just solved the weirdest issue. I couldn't codesign my app on my desktop Mac (I had been working on my laptop lately), so of course, I was faffing about in Xcode's certificates settings, trying to figure out what I had done wrong. Eventually figured out it seems I had corrupted admin trust settings on this specific Mac, tied to an expired Apple G1 cert. (Something got corrupted during a recent system migration or upgrade, perhaps?)
Weirdly, I had also been having weird Gatekeeper issues on this Mac, with signed apps from well known, good quality developers refusing to launch because macOS thought they might be malware. I bet it was all the same problem. #macOS #techsupport #codesign















