Sure, will do. I may have put too many comments above for you to have spotted the main one, which was this:
"Hi again Scribu
I've installed the version of the plugin you linked to, added the category-related code above to the theme's functions.php file and replaced 'YOUR-CATEGORY-SLUG' with the name of the relevant category, i.e., 'wikified'.
What happens now is that only posts in the 'wikified' category are editable by double-clicking them on the front end of the site (which is good). However, when you double-click, instead of bringing up the text of the post in the edit box, it brings up an empty edit box (not so good).
Any ideas on what is happening here please?"
Do you have any views on that one please?