[fixed] Strange black lines on background

[micheus]

On linux I have an nvidia card, so I can't test if it's ok with amd.

I have an AMD Radeon, so it's ok. Anyway, it was not a driver related issue.

One more thing. On linux, the -x, -y, and -z axis color from native theme has the same values than the background color (0.8 v), so they aren't visible. On windows the background is 0.67v.

The default theme should be the same for any OS. So, it seems at some point you changed the color (?!)