During an update from CONTENIDO 4.9.6 to CONTENIDO 4.9.7 the file config.php is not rewritten. Some tinymce 4 related settings such as the class name reside in config.php, though.
Move user independent config settings to a different file.
Make sure there is no conflict with new 4.9.7 installation config.php files during updates.
Test if tinymce 4 does work with updated CONTENIDO 4.9.6 installations.