Header disappeared – dazzling theme

I have been running a website with the Dazzling theme for quite some time, love the theme it was working well and the group very happy with it. After the last WP update the header has disappeared on the website even though it shows it is still attached when I go into Word Press. I’ve tried deleting the header and reinstalling to no avail. Does anyone have any suggestions?

The page I need help with: [log in to see the link]