Check auto updates settings on the following pages:
Tools & Settings > Application Vault > Update Settings
Applications > My Apps > Wordpress
Also there are the following command line options:
/usr/local/psa/bin/server_pref --update -aps-force-updates <true|false>
/usr/local/psa/bin/server_pref --update -aps-suggest-updates <true|false>
/usr/local/psa/bin/aps --install ... -aps-force-updates <true|false>