Broken Pages After Theme Update

Hi,

After updating our Fortuna theme a page broke . It no longer shows the header image. There are also other elements broken on the page. And, there is a Light Box feature with a form broken. The form in question is opened when a user clicks on the GET A QUOTE button in the main nav. The light box opens, but the form never appears. You only see a loading icon spinning in the upper left corner of the form box. Please Advise.

WEBSITE

Here are logins to the backend of the site: ADMIN LOGIN PORTAL
UN: themeSupport
PW: K0jPvUEQvD))%VZh0#LYlvSI