Hi helgatheviking,
after sleeping with hadache about this Trouble I awaked this morning and after trying I found the most simple way and solution for me to get the Menu Items (hide/showing) to work wihtout modifying any of the files and I would like to share with you and the community ??
So, what I did:
1.) I created all Menu Items which I need for my Website within my Sahifa theme.
2.) After creating the Menu Items I activated one of the included Themes which is installed within WordPress because my Template Theme Sahifa is incompatible with your plugin.
3.) Here I could make all the Settings for my Menu Items with the Nav Menu Roles Plugin. I created a seperate MenuItem for Login which is only visilbe for unlogged Users. And separate MenuItems which are only visible by loggedin Users.
4.) After I made all changes I switched back to my Sahifa Theme.
Important: The Nav User Role plugin have to be further activated.
Hope, this Solution helps other too. And as I described there is no Need to Change any line of Code ??
With best Reagrds, Karl