UBB.threads assumes you have a standard Apache based web server in place which is capable of running any standard PHP discussion script; server caching, especially with services or service providers is not something that we can support as there are any countless issues that can arise, again this is an issue that you really need to take up with your web host with any caching mechanisms they may have in place (on top of any mechanisms you've got in place as well such as CloudFlare on top of their settings).
