diff --git a/README.md b/README.md
index 0da65662..65d36819 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,6 @@ In order to execute code submissions using Docker, source code files are written
 - create production configuration files (*database.production.yml*, …)
 - customize *config/deploy/production.rb* if you want to deploy using [Capistrano](http://capistranorb.com/)
 
-The application is compatible with MRI and JRuby. Due to superior parallelism, we recommend using JRuby.
 
 ## Useful service maintenance commands
 
diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index 1fec0b1b..4f9d6a5b 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -174,8 +174,14 @@ class SubmissionsController < ApplicationController
   def parse_message(message, output_stream, socket, recursive = true)
     begin
       parsed = JSON.parse(message)
-      socket.send_data message
-      Rails.logger.info('parse_message sent: ' + message)
+      if(parsed.class == Hash && parsed.key?('cmd'))
+        socket.send_data message
+        Rails.logger.info('parse_message sent: ' + message)
+      else
+        parsed = {'cmd'=>'write','stream'=>output_stream,'data'=>message}
+        socket.send_data JSON.dump(parsed)
+        Rails.logger.info('parse_message sent: ' + JSON.dump(parsed))
+      end
     rescue JSON::ParserError => e
       # Check wether the message contains multiple lines, if true try to parse each line
       if ((recursive == true) && (message.include? "\n"))
diff --git a/app/views/exercises/index.html.slim b/app/views/exercises/index.html.slim
index 97847f1f..ae018e82 100644
--- a/app/views/exercises/index.html.slim
+++ b/app/views/exercises/index.html.slim
@@ -27,7 +27,7 @@ h1 = Exercise.model_name.human(count: 2)
       - @exercises.each do |exercise|
         tr data-id=exercise.id
           td = exercise.title
-          td = link_to_if(policy(exercise.author).show?, exercise.author, exercise.author)
+          td = link_to_if(exercise.author && policy(exercise.author).show?, exercise.author, exercise.author)
           td = link_to_if(exercise.execution_environment && policy(exercise.execution_environment).show?, exercise.execution_environment, exercise.execution_environment)
           td = exercise.files.teacher_defined_tests.count
           td = exercise.maximum_score
diff --git a/app/views/request_for_comments/show.html.erb b/app/views/request_for_comments/show.html.erb
index ab53ebd0..e4dc7f06 100644
--- a/app/views/request_for_comments/show.html.erb
+++ b/app/views/request_for_comments/show.html.erb
@@ -12,7 +12,7 @@
           limit 1").first['id'].to_i
         submission = Submission.find(submission_id)
       %>
-    <%= user %> | <%= @request_for_comment.requested_at %>
+    <%= user.displayname %> | <%= @request_for_comment.requested_at %>
   </p>
   <h5>
     <% if @request_for_comment.question and not @request_for_comment.question == '' %>
diff --git a/db/migrate/20160512131539_change_comment_text_attribute_to_text_datatype.rb b/db/migrate/20160512131539_change_comment_text_attribute_to_text_datatype.rb
new file mode 100644
index 00000000..cc039c6a
--- /dev/null
+++ b/db/migrate/20160512131539_change_comment_text_attribute_to_text_datatype.rb
@@ -0,0 +1,10 @@
+class ChangeCommentTextAttributeToTextDatatype < ActiveRecord::Migration
+  def up
+    change_column :comments, :text, :text
+  end
+  def down
+    # This might cause trouble if you have strings longer
+    # than 255 characters.
+    change_column :comments, :text, :string
+  end
+end