Suggestion to caedes: the new images gallery should default to sorting by date, because brand new posts aren't going to have a c-index, or (most likely) aren't going to end up being seen much if it's sorted randomly. Unless it already does sort by date by default, and for some reason the computer's I've tried it on were set differently ..?

I think it sorts randomly by default. This was initially set this way so that images in the permanent galleries were not always presented in the same order. I wanted all images to have an equal chance to be on the first page of a gallery.