On theme options –> color scheme
I have transpartent header activated.
With those settings the menu letters are always with “white” color base.
This mean that if the background fullscreen image is white, the visitor can’t see the menu letters…
If You take a look to all Your demos with fullscreeme background image, they have a white menu.
For instance on Your demo http://8theme.com/demo/royal/corporate-one-page/?et_styles=0-1-1-3-0-5 which has a white color image, the menu looks unreadable.