Answers.Body: <p>This is my answer pasted from <a href="https://civicrm.stackexchange.com/questions/19366/status-page-angular-load-error">this question</a></p>
  <blockquote>
  <p>We had one site that had 'lost' all it angular pages, eg CiviMail and System Status.</p>
  <p>In our case the angular cache files were returning 404 on the New Mailing page. (and 'inspector' was showing a lot of red angular errors)</p>
  <p>It was building the cache files in sites/default/files/civicrm/images, but then searching for them in sites/default/files/civicrm/persist/contribute</p>
  <p>The issue here was a mismatch between the resource url setting for Image Upload URL and the directory setting for Image Directory. Strangely (!!) these folders are being used for caching of angular files.</p>
  </blockquote>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-07-10T19:18:40.100Z
Answers.LastActivityDate: 2017-07-10T19:18:40.100Z
Answers.LastEditDate: 2020-06-17T09:00:50.810Z
Answers.UserDisplayName: petednz - fuzion
Answers.Body: <p>Try removing content of templates_c folder, location: sites/all/default/files/civicrm/templates_c</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2018-01-08T18:46:41.490Z
Answers.LastActivityDate: 2018-01-08T18:46:41.490Z
Answers.UserDisplayName: Hassan Farooq
Body: <p>I am using Drupal 7.56 and have just upgraded from CiviCRM 4.7.20 to 4.7.21 with a number of significant issues that will require that I revert to 4.7.20. When I try to display System Status - Warning nothing is displayed. When I try to continue to use a previous email, nothing displays.
  I don't have the luxury of doing anything more to understand the issues since I now need to revert to 4.7.20.</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2018-12-05T19:17:04.407Z
Comments.Text: martin - would be good protocol if you can accept either of the answers below or add your own (long time ago now but SE keeps pulling these back up as they have no +1 or green tick)
Comments.UserDisplayName: petednz - fuzion
Tags: <upgrade><4.7><angular>
Title: CiviCRM upgrade to 4.7.21 (Drupal 7)
ThreadText: # CiviCRM upgrade to 4.7.21 (Drupal 7)
  
  (Asked by: username_0 on 2017-07-10)
  
  I am using Drupal 7.56 and have just upgraded from CiviCRM 4.7.20 to 4.7.21 with a number of significant issues that will require that I revert to 4.7.20. When I try to display System Status - Warning nothing is displayed. When I try to continue to use a previous email, nothing displays.
  I don't have the luxury of doing anything more to understand the issues since I now need to revert to 4.7.20.
  
  **Tags:** upgrade, 4.7, angular
  
  > **Comments:**
  > **username_1**: martin - would be good protocol if you can accept either of the answers below or add your own (long time ago now but SE keeps pulling these back up as they have no +1 or green tick)  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2017-07-10. Score: 1
  
  This is my answer pasted from [this question](https://civicrm.stackexchange.com/questions/19366/status-page-angular-load-error)
  
  > We had one site that had 'lost' all it angular pages, eg CiviMail and System Status.
  >
  > In our case the angular cache files were returning 404 on the New Mailing page. (and 'inspector' was showing a lot of red angular errors)
  >
  > It was building the cache files in sites/default/files/civicrm/images, but then searching for them in sites/default/files/civicrm/persist/contribute
  >
  > The issue here was a mismatch between the resource url setting for Image Upload URL and the directory setting for Image Directory. Strangely (!!) these folders are being used for caching of angular files.
  
  
  ---
  
  ### Answer by username_2 on 2018-01-08. Score: 0
  
  Try removing content of templates\_c folder, location: sites/all/default/files/civicrm/templates\_c
  
  
  ---
  
  