Hi,
In the documentation to upgrade from version 4.3 to 4.4 of ezpublish, there are some missing steps for the upgrade to work.
In the end of the steps described in the upgrade document, we still need to:

• Change the extensions permissions ( $chmod a+rwx -R extension)
• Update some packages as referred in the following links:
• (Webin): http://ez.no/doc/extensions/website_interface/website_interface_1_6_upgrade
• (eZFlow): http://ez.no/doc/extensions/ez_flow/ez_flow_2_1_upgrade
• After the package update, we need to verify that the updated extensions are activated in settings/site.ini or in settings/override/site.ini.append.php
• Then we need to regenerate the autoloads ($ php bin/php/ezpgenerateautoloads.php --extension)
• Then we need to clear cache again: ($ php bin/php/ezcache.php --clear-all --purge)