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http://forums.modx.com/thread/16659/revolution2-0-0-what-am-i-doing-wrong-with-permissions#dis-post-89822

If those are Context Access ACLs, the policy should always be Administrator (or a duplicate policy with fewer permissions).

If they are Resource Group Access ACLs, the policy should always be Resource (or a duplicate policy with fewer permissions).

FYI, it’s often simpler to control access to stuff in the manager by creating a tree_root_id user setting for each user. Then they’ll only be able to see resources in or below that ID.