Please explain why you say it is definitely not.
Cats4U
Go into temp/metapicture. If you haven't cleaned this out, it'll have hundreds (maybe thousands) of files. Being 'temporary', they should be cleaned out after use
For now, it appears that this might be resolved (partially). The largest bit of content (outputtemp) appears to be good. However, it's not fully cleaned out, and needs to be when not used.
The only thing in there should be temporary stuff (such as cache). If that ever gets over a gig, it's too much.