CiviCRM Community Forums (archive)

TL;DR version: Newest ACL rule causes contacts specified by old rules to disappear even though the groups themselves are still listed.

Example:

User 1 is created and is subject to Drupal's "authenticated user" permission set, I uncheck the ability to view or edit all contacts because I want different users to see different contacts.

Access Control Group is created, access control is checked, and User 1 is added to it.
Group A is created with 100 unique contacts.
Group B is created with 200 unique contacts.
Group C is created with 300 unique contacts.

ACL rule A is created to allow User 1 to view Group A.
User 1 sees Group A on the group listing with 100 contacts.
User 1 clicks on Group A and sees its 100 contacts.

ACL rule B is created to allow User 1 to view Group B.
User 1 sees Group A on the group listing with 100 contacts.
User 1 clicks on Group A and sees no contacts.
User 1 sees Group B on the group listing with 200 contacts.
User 1 clicks on Group B and sees its 200 contacts.

ACL rule C is created to allow User 1 to view Group C.
User 1 sees Group A on the group listing with 100 contacts.
User 1 clicks on Group A and sees no contacts.
User 1 sees Group B on the group listing with 200 contacts.
User 1 clicks on Group B and sees no contacts.
User 1 sees Group C on the group listing with 300 contacts.
User 1 clicks on Group C and sees its 300 contacts.

If ACL rule C is disabled, Group C disappears and Group B's contacts become visible
Subsequently, if ACL Rule B is disabled, Group B disappears and Group A's contacts become visible

Am I misunderstanding how ACLs work? Is this a known issue? A suggested workaround/solution would stop me from going insane. Thanks in advance.

Edit: I have a theory that the id number in the civicrm_group table is a factor. The group with the highest id number seems to prevail (i.e.: the group created last).