Selection menu highlight not working anymore

I’m referring to the selected item’s color that shows up when the selection menu is visible. This color is the one that can be selected in Rhino Options > Selection Menu > Highlight.

Works correctly in a new file:

This is what is doing in my project:
Should appear in blue as in the previous gif but it doesn’t.

Happens with any view, shaded, rendered, wireframe… anything.

How to fix this? I’m using Rhino 5.

Thank you!

Hello - can you post the file, or surfaces, for which this does not work?