diff --git a/app/models/issue.rb b/app/models/issue.rb
index 96c3f85..cfbe1bd 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -105,7 +105,7 @@ class Issue < ActiveRecord::Base
       when 'all'
         true
       when 'default'
-        !self.is_private? || self.author == user || user.is_or_belongs_to?(assigned_to)
+        !self.is_private? || (self.author == user && user != User.anonymous) || user.is_or_belongs_to?(assigned_to)
       when 'own'
         self.author == user || user.is_or_belongs_to?(assigned_to)
       else
diff --git a/app/models/user.rb b/app/models/user.rb
index d0d1df8..b8cd746 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -464,7 +464,7 @@ class User < Principal
 
       roles = roles_for_project(context)
       return false unless roles
-      roles.detect {|role|
+      roles.any? {|role|
         (context.is_public? || role.member?) &&
         role.allowed_to?(action) &&
         (block_given? ? yield(role, self) : true)
@@ -483,7 +483,7 @@ class User < Principal
       # authorize if user has at least one role that has this permission
       roles = memberships.collect {|m| m.roles}.flatten.uniq
       roles << (self.logged? ? Role.non_member : Role.anonymous)
-      roles.detect {|role|
+      roles.any? {|role|
         role.allowed_to?(action) &&
         (block_given? ? yield(role, self) : true)
       }