I was trying to modify the Fullwidth Page template. I was editing the file "template-fullwidth.php" but none of the changes were having any effect.
Anyway I discovered that the following file is also defining the Fullwidth Page template "attachment.php". I renamed the template name in this file and voila my changes appeared.
Anyway, my question is why is one template defined twice in two different files with very different designs. And given that this file is title "Attachment Template" does it mean that there is supposed to be a template for attachments???
Can you clarify or fix this please?