10.11.4 Kext signing changed?

I am noting that with updating from 10.11.2 or 10.11.3 to 10.11.4 my audio device UAD Apollo TB drivers seem to no longer working as it does not see the device so wondering if anybody knows of kext changes in 10.11.4?

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FYI: 10.11.4 Beta Seed 3 seems to have resolved the UAD kext signing issue by just updating to Beta Seed 3 from Beta Seed 1 or 2. Might also fix issues with other devices with simiar kext signing issues.