It seems only alerts for Likes were working.
Fixed alerts in the next release. Also fixed the same content not appearing in the News Feed. Also fixed comment attachments which were invisible for the same reason.
Fixed the 'unread' variation of New Wiki Updates & Comments tabs. It was showing no results for pages/discussions that you never visited before, or if VaultWiki didn't record your visits due to other settings. The same issue affected the new posts search for vBulletin as well.