diff --git a/app/models/issue.rb b/app/models/issue.rb
index 707c458..3a063c9 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -810,7 +810,7 @@ class Issue < ActiveRecord::Base
   # Users the issue can be assigned to
   def assignable_users
     users = project.assignable_users.to_a
-    users << author if author
+    users << author if (author && !author.anonymous?)
     users << assigned_to if assigned_to
     users.uniq.sort
   end
diff --git a/app/models/issue_priority.rb b/app/models/issue_priority.rb
index b925c3e..e5b2d47 100644
--- a/app/models/issue_priority.rb
+++ b/app/models/issue_priority.rb
@@ -19,7 +19,7 @@ class IssuePriority < Enumeration
   has_many :issues, :foreign_key => 'priority_id'
 
   after_destroy {|priority| priority.class.compute_position_names}
-  after_save {|priority| priority.class.compute_position_names if priority.position_changed? && priority.position}
+  after_save {|priority| priority.class.compute_position_names if (priority.position_changed? && priority.position) || priority.active_changed?}
 
   OptionName = :enumeration_issue_priorities
 
diff --git a/test/unit/issue_priority_test.rb b/test/unit/issue_priority_test.rb
index e9d44b6..afce368 100644
--- a/test/unit/issue_priority_test.rb
+++ b/test/unit/issue_priority_test.rb
@@ -99,6 +99,20 @@ class IssuePriorityTest < ActiveSupport::TestCase
     assert_equal %w(lowest default high4 high3 high2 highest), IssuePriority.active.to_a.sort.map(&:position_name)
   end
 
+  def test_moving_a_priority_should_update_position_names
+    prio = IssuePriority.first
+    prio.move_to = 'lowest'
+    prio.reload
+    assert_equal 'highest', prio.position_name
+  end
+
+  def test_deactivating_a_priority_should_update_position_names
+    prio = IssuePriority.active.order(:position).last
+    prio.active = false
+    prio.save
+    assert_equal 'highest', IssuePriority.active.order(:position).last.position_name
+  end
+
   def test_destroying_a_priority_should_update_position_names
     IssuePriority.find_by_position_name('highest').destroy
     assert_equal %w(lowest default high2 highest), IssuePriority.active.to_a.sort.map(&:position_name)