I'm using WP Super Cache on Multisite. One of the sites we've added a custom post type for "Horses." We then have a couple of page templates that list all the horses according to certain categories. See the pages here: http://memoryranches.com/horses-for-sale/ & here: http://memoryranches.com/our-horses/.
The rest of the site seems to update the cache normally. However, when new horses (custom post types) are added, these pages don't get updated. They'll sit for days without the cache refreshing. Even clicking the button to delete the cache for that site doesn't seem to help. The only way I've found to get them to refresh is to FTP into the site and delete the folders for this particular site in the cache/ blogs & supercache folders. Any ideas why?