F.lux buggy when external monitor is connected (since macOS Security Update 2020-002)

  • Hi, since the last macOS Security Update 2020-002 (I'm running Mojave 10.14.6), f.lux is behaving erratically when I connect my external screen while f.lux is active (after sunset). When I connect the external monitor, both screens start switching between the different color schemes (f.lux active/inactive) and the system stalls for a while.

    As the release notes for Security Update 2020-002 mention fixes to AppleGraphicsControl, there might be some connection to the issues I'm experiencing now. Are these issues known? Is a fix incoming? It is really quite disruptive, but I would hate having to switch off f.lux altogether.

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