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 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.

The iPhone 5 is expected to make its debut in China next month, and that’s looking increasingly likely now that the device has received its third and final license from China’s Telecommunications Equipment and Certification Center (TENAA).