Backend Checkboxes working – but not visual?

The answer for me was related to my web servers Content Security Policy. Needed to add “data:” as a possible source

default-src data: 'self' *.googleapis.com *.gstatic.com;

If you are using more specific CSPs like font-src: and img-src: you may also need to allow it within those as well.

Related Posts:

  1. Appearance->Editor not visible
  2. Dashboard menu missing
  3. Add a Separator to the Admin Menu?
  4. Adding a custom admin page
  5. How to remove entire admin menu?
  6. How do I remove dashboard access from specific user roles?
  7. How to Change the Default Home Page for the WordPress Dashboard?
  8. Plugin to remove Admin menu items based on user role?
  9. 3.3: How do you hide the new dashboard welcome panel?
  10. Add my own button next to “Screen options” and “Help” in the admin
  11. How can we customize the logo and some text on the welcome screen?
  12. Can I set a default dashboard layout for all users?
  13. How to show custom menu items in the WordPress android app?
  14. Remove ability to access certain admin menus
  15. Custom WP_List_Table displays blank rows
  16. How do I set up a webhook?
  17. Make sub menu items a main link in the admin menu using fuctions.php
  18. Admin pages have no content
  19. WordPress Left Hand Side Admin Menu Always Collapsed
  20. Reorder plugin items in the admin menu
  21. Re-ordering Admin Submenu Sections
  22. Reference external file as a function
  23. Add number new posts (post_status = pending) to administration menu [duplicate]
  24. Which hook for processing plugin page form data?
  25. add_submenu_page set for multiple roles [duplicate]
  26. How To Create User Specific Admin User Pages?
  27. Change the Default Pages Menu View in wp-admin
  28. How to change admin menu position of “Media”?
  29. Change top level menu item to point to custom submenu item
  30. Associating custom submenu item with post type of top level menu item
  31. How to solve 500 Error on WordPress Admin Dashboard due to time-out on getdirsize
  32. Admin doesn’t have sufficient permissions to plugin’s page
  33. How to get view count of every page on site and add that (increasing) number to Dashboard Widget
  34. Remove Admin sidebar link
  35. Single category’s posts list in admin menu
  36. Can’t access dashboard as administrator, login as any other level works though
  37. Get post attached image to display in admin dashboard
  38. WordPress Remove Submenus
  39. Continuous Login Sessions For Super Admins Across Multi-Site Network of Sites
  40. Modifying the built-in behavior of ajax tag type-ahead functionality of WordPress
  41. page not updating with database
  42. Why am I timing out when using the Menu Editor?
  43. 500 internal server error on wp-admin only
  44. How can I POST or GET to the same admin page from which I am POST-ing or GET-ing
  45. Output the admin menu_position for each item
  46. How to activate the dashboard
  47. avoiding the display of certain categories to certain user roles at content entry time
  48. How can I add a menu item to the admin area?
  49. Admin top level menu, pointing to an external url
  50. WordPress Admin Menu Order for ‘admin.php’ pages
  51. Given multiple admin accounts, how can I make it so that only admin with X username can edit posts
  52. Top toolbar is not showing in wordpress admin panel
  53. Want to know who is login Admin/User
  54. Dashboard RSS Widget Overhaul
  55. Extending the user profile [closed]
  56. Give admin_menu permission to specific users
  57. Show all admin menus in a table
  58. How To Create WordPress Dashboard Item
  59. Adding a WordPress Admin Dashboard to my local wordpress site
  60. Highlight active Admin Menu when added though add_menu_page
  61. require/include php file in add_menu()
  62. Create WordPress Menu Item Without Linking to a Custom Page
  63. Sortable admin columns by 0.00 number
  64. WordPress4.1.15 Dashboard links not working
  65. Simple CSS admin pagination
  66. Unable to render Admin Notices
  67. My code for creating an admin option doesn’t work
  68. How to change the default url for ‘Posts’ link?
  69. Unsure how to add simple checkboxes that write to a small table to admin
  70. Add a link to the Admin menu
  71. WP Logs me out after updating anything on dashboard
  72. Reference external file as a function
  73. TinyMCE buttons broken
  74. WordPress admin panel is blank
  75. Display admin sidebar into custom post pages if logged
  76. How to add filter in “Comments” at the admin panel?
  77. List All Post Types in Admin view using /wp-admin/edit.php?post_type=
  78. WordPress 3.8 get current admin color scheme
  79. Can you have the users list pre sorted by specific column?
  80. remove_action with profile_personal_options
  81. With WP 3.4 customizer, while using postMessage & working within your JS for one option, can you retrieve current value for another option?
  82. $user_id vs. is_user_logged_in()
  83. Assuming a theme is properly secured, how save is the WordPress admin?
  84. WordPress How to begin editing from admin page (please see picture)
  85. Save author posts as in pending review – block users updating their posts
  86. Enqueue and Dequeue from admin bar nodes
  87. How to enqueue admin content outside admincp
  88. Where can I store common cross-site text (e.g. headings, titles etc.)
  89. get_current_screen and the WP_Screen class
  90. Excerpt showing under title in admin columns
  91. how to remove +new from wp admin area
  92. html id is removed for non admin user?
  93. How to show a custom notification to a specific user?
  94. Allow users to give a dashboard widget a custom name using ACF
  95. my wordpress configuration locally vs live server
  96. Why does my admin email address keep changing to something random?
  97. WordPress Admin Doesnt work
  98. WP administration over SSL using different domain
  99. Getting 404 page not found error while trying to access add new plugin / themes
  100. Content is displayed under admin bar [closed]