The logged in user is shown as "Undefined" after upgrading

Document ID : KB000092786
Last Modified Date : 23/04/2018
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Why does the logged in user display as "Undefined" in PPM, after upgrading to the latest version?
The cache may have become corrupted after upgrading. To resolve this, you will need to flush the browser and application cache by performing the following steps:
  1. Clear the browser cache
  2. Clear the CA PPM Server Cache
    1. Login to CA PPM as an admin user
    2. Modify the URL field to  http://<svr>/niku/nu#action:security.caches
    3. Click Caches tab and click FLUSH ALL button
    4. Click Groups tab and click FLUSH ALL button
  3. Restart CA PPM app services