Been using this monitor for a few months now and been really happy with it but since last week I've had a really weird issue. I suspect it's Windows being Windows, but it seems to have night mode filtering enabled only on this monitor. Checked the monitor night mode itself and that's off, so no issue there. When I go into Windows display settings and click graphics settings, clicking back out of this settings to the general display settings turns the night mode off, but as soon as I change my focus off of that settings screen the night mode reverts back. The actual setting in Windows for night mode is off, but if I enable it it seems to get applied again - so twice on the Iiyama monitor and once on my other monitor. Really frustrating! Edit: ignore me I'm an idiot. Even though I thought I'd checked that f.lux was disabled to rule that out it was only disabled on one monitor not the other. Classic case of PEBKAC.