Secure Remove Image not displayed for unsafe images

Hello,
I am using Apache 2.4 with PHP7.0 on a linux CentOS 7 system
My squirrelmail version is the 1.4.23, squirrelmail-20170203_0201-SVN
      brought down and untarred from the squirrelmail site.
  Installed Plugins
     1. squirrel_logger - 2.3.1
     2. abook_import_export - 1.1
     3. calendar
     4. message_details
     5. squirrelspell
     6. delete_move_next - 3.1.0
     7. newmail
     8. translate - 1.3
     9. add_address - 1.0.3
     10. quicksave - 2.4.5
     11. multilogin - 2.4.2
     12. auto_cc - 2.0
     13. addgraphics - 2.3
     14. advanced_settings - 1.2.1s- 1.2.1smm
     15. get_uuencode - 3.2
     16. view_as_html - 3.8
     17. html_mail - 2.3
     18. preview_pane - 1.2
     19. select_range - 3.7.1
     20. tnef_decoder - 1.0
     21. autorespond - 0.5.1

We use the following rpm versions for postfix and dovecot (CentOS 7) ;
postfix-2.10.1-6.el7.x86_64
dovecot-2.2.10-7.el7.x86_64

My problem:
     In both firefox and chrome, when viewing html mail only a blank window
is shown where the unsafe image was removed.    I never see the
"removed image for security reasons".  This is the same for all users.
     There are no errors displayed in my logs; httpd, squirrelmail, nor php.

If someone can help me with this, it would be great.  We have been running
squirrelmail for some time now and I am bringing up a new server.  I have
installed everything by hand and compared this with the old server. When
I inspect the image, it appears that the call is to "blank.png" instead of
to "sec_remove_eng.png" as in my other older installation.

Aloha, Sharon Stahl


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