Please read my posts above and this should assist you.
http://www.thedailyscrapper.com/gallerylo/data/522
Your directories do not exist.
Index of /gallerylo/data/514
where are the mini thumbs and medium directories beneath the actual cat id directory.
You need to get to the bottom of your issue based on my posts and determine why your data directories do not exist.
I dont know why there is a post by another username in this thread but at any rate the information posted here is correct.