I needed to modify a module's .tpl file and so copied it, renamed it to something suggested by Theme Debug's file suggestions.
Eg when I run
drush theme_debug I see:
<!-- FILE NAME SUGGESTIONS: * image-resp-item--f6.tpl.php x image-resp-item.tpl.php -->
So I rename my new file
image-resp-item--f6.tpl.php and place it in my site's theme.
I clear cache and rebuild the theme registry but to no affect - the site still uses the original .tpl.
To experiment, I change my new .tpl's name to match the old one (remove
--f6). This works - I see my new code appear on the site.
Why is my site (or theme?) not wanting to use the suggested file name?