It normally works fine, but if I turn off one monitor for a while (it still works fine while it's off), when I turn it back on the temperature on my main monitor goes yet further red shifted. Exiting Flux doesn't fix it - BUT if I then re-launch flux, it goes back to normal.
It's a pain to re-launch flux every time I turn my monitor off or on.
This didn't used to happen. One of the more recent updates caused it to start.