F.lux + USB monitor = dark grey tint

[tryagain]

When my USB monitor and flux is activated both screens gets a very dark gray tint. Its not like the normal orange tint I get when using flux without the USB monitor. I tried adjusting the settings in flux but there is no changing the very dark gray tint.

I am wondering if anyone has faced this issue and know a fix?

[herf]

Which GPU and Windows version?

[tryagain]

I use a laptop that has switchable graphics AMD Radeon HD 6620G and AMD Radeon HD 6750M

Windows 10