Flux changes color for another user account
I have two user accounts on my macbook air (os sierra, 10.12.1) and exceptionally on my own user account there is flux (V 37.7) installed.
But from time to time on the other user account the colors get changed, and this during daytime. As on the other account there is no Flux installed, it's even not possible to quit the app. So I have to reboot from time to time to get the colors "right" again.
What can I do to get this fixed?