title: Activity stream missing after JIRA upgrade
body: <p>I upgraded our JIRA from version 6 to version 6.1. Suddenly the Activity Streams are always empty. It is very annoying for the users who were very dependent on them. So I need to get the activity streams back.</p>
  
  <p>What I have tried so far:
  1. Reindexing
  2. Creating a new widget for activity stream</p>
  
  <p>What log can I look into to see what is broken? Do I need to create a new filter or something?</p>