If a customer calls and tells you that she cannot see some content of her website beware of the following before starting tcpdump or other forensic debugging tools.

Growing Rails Applications in Practice

Check out our e-book. Learn to structure large Ruby on Rails codebases with the tools you already know and love.

• Introduce design conventions for controllers and user-facing models
• Create a system for growth
• Build applications to last

Read more Show archive.org snapshot

Some ad blockers like Adblock Show archive.org snapshot are shipped with filters that remove (amongst others)

• divs named 'sponsor'
• images with a class "banner" or the filename "banner.png"
• images from directories named 'sponsor*'
• Image names or class names that begin with adv_....

Renaming the div to something more specific to your site and renaming the directory should fix the issue. Pardon me! It fixes the feature.