I had this same issue, SIR PATRACY with great patience despite the NON KGR help me figure out how to do what I wanted to do in the first place, this is why the "Code name BART" thread is up, I believe it has something to do with the total number of pictures that can be stored, being the pictures are part of a thread (past or present), they can not be deleted, so I guess the only way to delete the pictures is to delete the post they are in but is seems the only way to delete the post is to delete the thread which we really do not want to do.