I have a formula field that makes use of IMAGE function to show an image from a url. It goes like this:
HYPERLINK(URL__c , IMAGE( URL__c , "Photo unavailable", 400, 400))
The image itself doesn't show in Salesforce.com page but clicking the image navigates to the page outside of SF showing the image. The actual image used to show the image on the SF page (btw this is on a Standard page layout, not VF or Apex). So I can assume the link is correct if I'm navigated there when I click.
The URL__c field is a dynamic formula field that creates the URL based on the record selected.
Why would this all of a sudden not work? I.E. Why did it stop showing me the image in SF page layout for the selected record? This is something that has been working in production for over a year.
Formulas in Prod and Sandbox are identical. URL__c are built exactly the same.