User blog comment:Harbumz/Introducing Vignette, Wikia's New Thumbnailer/@comment-452-20150212014153/@comment-31845054-20150212021754

There was no documentation that I was aware of, but we found some instances sprinkled around the codebase. No specific instance comes to mind, sorry.

Vignette might be related to the template issue, though. Can you link to a page that has the issue?