Solution: Add the site to the Trusted Sites list, and set security for Trusted Sites to 'low'.

  1. Log into the site from Internet Explorer
  2. Click the 'Tools' icon (looks like a gear, at the top-right of the window), go to Internet Options
  3. Click the Security tab
  4. Click on the Trusted Sites icon
  5. Click the Sites button, make sure that is on the list, if not, add it, then click the Close button (don't close out of the main Internet Options box yet)
  6. Set the security slider for Trusted Sites to Low (if you don't see the slider, click the 'Default level' button first
  7. Click Ok
  8. Close and re-open Internet Explorer