Yesterday, I had a friend over with his new MacPro running Yosemite. He was still running the last v3 beta, and it was only now when he noticed the viewports' background and grid colors were a bit odd. It looked almost inverted, quite a bit darker gray, and you could barely distinguish the origin axis compared to the grid (lines were brighter than the background).

Object display was OK though, as was the look of the rest of the UI.

We made sure it grid settings were reset to their defaults, but the problem remained when doing a screen-by-screen comparison with my display.

Did anyone else notice this? It probably can be remedied by custom color settings, but it was kind of odd to see.