Again as I have said I would not suggest doing anything until you investigate why you have the issue. Like I said if the user your talking about does not exist in your new forum then all your doing is going to be orphaning your images and messing things up worse then they already are.
The script I wrote is foolproof so if something did not change then that username does not exist in your new forum. Thats why nothing was changed for that one user.
The userfix script issues a query that basically grabs the userid from your new forum based on what the username is. If there is no result then nothing is changed in photopost. if there is a result then the userid is updated.
I hope you follow what I am saying now.
If you insist on going further manually without investigating why the user is not found fine but I will not post on this issue further if anything goes wrong for you so be warned.
UPDATE pp_categories SET parent=6 WHERE cattype='a' AND parent=3;