I have a Content Editor Web Part, pointing to an html file at the web app's root (Content Link = "/Style Library/MyCollaborationWebParts/MyCollaborationLinks.html"). The content showed by the CEWP however is an old version of the html file.
To be clear, the site containing the CEWP has been created by backup and restore, or some other such process. It originally had no Content Link value; yet it showed an old version of the html file. I filled it in recently, and the content showed did not change at all.
I have cleared my browser's cache.
I have clicked on the "preview" link and confirmed that I could see the html file
It might be of interest that the CEWP is sitting inside another CEWP