I was doing some client work this weekend, when this new feature I added had the weirdest behavior: images from a particular folder simply would not load. 

If I uploaded them to a separate folder, they would work fine. But not in one folder. 

When I debugged it in Chrome Toolbar, the image would just show as "Pending." When sniffing the request even further, it seemed that the Apache server wasn't serving up full headers. What was kililng me was it was working fine in Firefox, and when I loaded the image directly. It simply would not load when embedded. 

I spent a solid hour looking at the server, .htaccess files, even CodeIgnitier to see what was causing the image to suppress showing. 

Then, it struck me. The name of the folder? "offers_adverts"

Yeah, AdBlock in Chrome was blocking the image. 

*facepalm*