Some popular Mac apps fail as developer certificates expire

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1Password is one of the apps that stopped working this weekend.
Photo: AgileBits

Several popular Mac apps began crashing over the weekend after their developer certificates expired.

The apps suddenly refused to open due to a change Apple made to its signing policy last year. Apple now requires that all apps from the Mac App Store have a valid provisioning profile that must be updated periodically.

McAfee Revokes Key For Signing Mac Apps, Anarchy Ensues

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McAfee has told customers of its antivirus applications for Mac to “just allow untrusted certificates” after a company administrator accidentally revoked the digital key used to certify its software. For more than a week, users have been unable to install McAfee products on a Mac, and the company’s only workaround so far is to allow untrusted certificates, which could pose risks to its customers’ machines.