Blog Remains Marked as Spam Even after Marking as Not Spam

I have attempted to use both the “Unsplog” link in the header (which seems to at least do something most of the time) and the “Ignore” option in the moderation queue in the network dashboard to mark a new blog which I, as a super admin of the site, created, but the blog remains marked as spam. It does not show as marked as spam in the backend (either in the Anti-Splog menu in the navigation bar or in the moderation queue in the network dashboard), but users visiting the sites are greeted by the “Our automated filters have determined…” message. I am uncertain of why this is occurring or how to go about fixing it.

[Mods: Please move this to the appropriate subforum, it would not allow me to select Anti-Splog when creating this thread.]