We apologize for the instability of composr.app and appreciate your patience. We are working on the statistics addon and trying to find an optimal way to store and render data. Unfortunately, we have yet to find a solution that can handle the traffic (and therefore, tens of millions of statistical records) of composr.app. We're working hard on one.
#2733 - Menus being displayed even when user does not have view permission for the destination.
What exact version does this effect, and are we definitely talking actual page permissions and not category permissions (which aren't supported with menu checks)?
I imagine either it's an older v10 RC, or a confusion about the difference between page and category permissions.