FYWP = "Fuck You WordPress". http://www.balloon-j.../?page_id=28596#F

In paraticular:

http://www.balloon-j...4#comment-1579527

From the wp-super-cache docs:

WP Super Cache
...
This plugin generates static html files from your dynamic WordPress blog. After a html file is generated your webserver will serve that file instead of processing the comparatively heavier and more expensive WordPress PHP scripts.
...
The static html files will be served to the vast majority of your users, but because a user’s details are displayed in the comment form after they leave a comment those requests are handled by PHP. Static files are served to:
...


1. Users who are not logged in.
2. Users who have not left a comment on your blog.
3. Or users who have not viewed a password protected post.

I think we have a culprit


Thanks, all.

Cheers,
Scott.
(Who understands WordPress is one of the most popular blog frameworks... :-/ )