With the changes to the thumbnail system, it appears that all custom thumbnails have been cleared and new ones generated from the actual submission.
Are there plans to have these thumbnails restored, or is it going to be on the gallery owner to go through and manually apply a new thumbnail image to these submissions (an onerous task for some people, who have exceedingly large galleries and use customized thumbnails on nearly ALL of their pieces).
I know there are a lot of users who tag their images via the thumbnail, warning people of what the image contains without showing the full picture (e.g. vore, gore, tentacles, "goo stuff," rape, etc.)
I use the custom thumbnail on my submissions only rarely, but I do appreciate when an artist uses it to denote a picture that might be too extreme for my tastes and I know to avoid viewing that image, whereas a thumbnail is dense and potentially misleading.