Index: UI/AdministrationUI/UIxAdministrationAclEditor.m
--- UI/AdministrationUI/UIxAdministrationAclEditor.m.orig
+++ UI/AdministrationUI/UIxAdministrationAclEditor.m
@@ -137,7 +137,7 @@
       // Add the 'Any authenticated' user
       if ([self canSubscribeUsers])
         {
-          userData = [NSDictionary dictionaryWithObjectsAndKeys:
+          userData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                      @"<default>", @"uid",
                                               [self labelForKey: @"Any Authenticated User"], @"cn",
                                    @"public-user", @"userClass",
@@ -148,7 +148,7 @@
       if ([self canSubscribeUsers] && [self isPublicAccessEnabled])
         {
           // Add the 'public access' user
-          userData = [NSDictionary dictionaryWithObjectsAndKeys:
+          userData = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                      @"anonymous", @"uid",
                                    [self labelForKey: @"Public Access"], @"cn",
                                    @"public-user", @"userClass",
