Weird grid coloring behavior in 17.5.173.

As soon as I add geometry to the scene, the grid in scene view becomes impossible to see. If geometry is deleted or made turned OFF the grid and GUI return to normal.
Basically I set the colors and Gamma of GUI as I prefer. The grid is drawn as slightly lighter. As soon as geometry is added or made visible, the grid inverts its color and is lost in backround. Neither Preferences nor Color Settings fix this.