Was trying to get both field_permissions and content_access modules to work, and discovered this node_access business for the first time. I've realised that most modules dealing with this have used Drupal's role rid as the gid when writing access rules, which is logical because it maps roles to grants simply, but the gid column is INT. Backdrop no longer has a rid, so to get his to work, I've had to write a doubtful function which maps each role to an INT, stored in config. Not fun.
Can that column be changed to simply accept the role's name rather than a rid? What would be the implications of this?
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Amilenkov's suggestions are spot on. As for the greyed out Menu module, that's because there must be another module that depends on Menu. Core will gray out modules that cannot be disabled (e.g...
menu partially working
Welcome to the Backdrop community! My first suspicion would be access to the destination page. Backdrop checks access when building the menu, so a link can be enabled but still be hidden...
menu partially working
here's the view when not logged in (ie with no 'sustainable computing' visible but is visible when i login as admin:
menu partially working