I'm coming back with this problem.
I've installed and setup membership plugin. Everything works fine except that sub-menus & footer & top admin bar (when logged of course)do not show in blog posts !
Here is a link to the blog where sub-menus & footer & top admin bar works fine:
Here is a link to a post where footer & sub-menus &top admin bar (when logged of course)do not show :
When I deactivated membership plugin, everything come back to normal behaviour
Thanks for your help