One thing you could try is to rename your admin directory to:
/your_admin_directory_old
and reload the whole directory:
/admin
from a clean v1.3.9h to your site and call it:
/your_admin_directory
and copy your file:
/your_admin_directory/includes/configure.php
and see if that works, as a test on Featured Products ...
That might at least rule out is it something in the directory ...
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