Multi Monitor Setup F.lux not working on second monitor.

[Can_Erduman]

I really like the idea behind F.lux.
Under Windows 10, I have the problem that my second monitor seems not to get the changed colorspace. it s in the evening, Monitor 1 yellowish, Monitor 2 Bluish.

Is the second monitor not checked by F.Lux or are there some settings to get it setup?
thanks!