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.

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• Design tailored to your audience
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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.