I also have run into problems with menu designer. Un"Include root menu" solved one of my problems. The current problem is I can't get rid of "My Video" appearing on the first screen. I set the font color to black and moved it off the screen to the upper right in both the Root Menu and Titles/Chapters Menu. It is does not show in menu designer, but does show with the same radiant color it was originally defined with.
When I had a root menu, I thought it would carry over from the root menu, but it does not. The root menu showed the edited title in place of My Videos, but the Titles menu does not change.
Paul C