ToME: the Tales of Maj'Eyal

This is a really weird issue, it's not gamebreaking or particularly annoying, but it did make me curious.

So, why does the color scheme of my screen change when I launch the game? I'm not exactly sure which colours change (i think it gets more blue-ish), but even my browser changes its colours when I launch ToME. What's up with that?

You have a utility of some sort providing color correction/gamma adjustment/etc, and ToME is battling for control with it. I have a similar issue when f.lux is active.