I'm also having the same issue where f.lux doesn't work on my 2nd monitor.

  • Re: f.lux won't run on second monitor

    The 2nd monitor's HDMI cable is connected to a USB display adapter that's plugged into a USB port on my laptop.

    Adapter Name: MCT USB3.0 External Graphics Device
    Driver Provider: Magic Control Technology Corp.
    Driver Date: 6/20/2020
    Driver Version: 1.4.2001.620

    That would be great if you are able to fix it, thank you, Kurt

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