Muchisimas gracias valledeluz; that worked for me.On the System Preference, open Accessibility panel, then click on Screen icon on the left column. Be sure that Reduce Transparency setting BOX is not selected.
Muchisimas gracias valledeluz; that worked for me.On the System Preference, open Accessibility panel, then click on Screen icon on the left column. Be sure that Reduce Transparency setting BOX is not selected.