Had my new SEL Executive for less than a week so forgive me if this is a dumb question, but I do not seem able to activate the Light Assist function which should be included on this model. Attached is a screenshot of the settings page and there is no activate/deactivate tick box against Light Assist. I made sure I wasn't in Eco mode and checked all the other pre-requisites in the manual, but cannot get the "auto" light on. Any thoughts gratefully received.