Index: app/models/user.rb
===================================================================
--- app/models/user.rb	(revision 19478)
+++ app/models/user.rb	(working copy)
@@ -634,7 +634,7 @@
     Project.unscoped do
       return @project_ids_by_role if @project_ids_by_role
 
-      group_class = anonymous? ? GroupAnonymous : GroupNonMember
+      group_class = anonymous? ? GroupAnonymous.unscoped : GroupNonMember.unscoped
       group_id = group_class.pluck(:id).first
 
       members = Member.joins(:project, :member_roles).
@@ -970,7 +970,7 @@
 
   def validate_anonymous_uniqueness
     # There should be only one AnonymousUser in the database
-    errors.add :base, 'An anonymous user already exists.' if AnonymousUser.exists?
+    errors.add :base, 'An anonymous user already exists.' if AnonymousUser.unscoped.exists?
   end
 
   def available_custom_fields
Index: lib/redmine/acts/positioned.rb
===================================================================
--- lib/redmine/acts/positioned.rb	(revision 19478)
+++ lib/redmine/acts/positioned.rb	(working copy)
@@ -66,7 +66,7 @@
             h[column] = yield(column)
             h
           end
-          self.class.where(condition_hash)
+          self.class.unscoped.where(condition_hash)
         end
 
         def set_default_position