UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support some members can't post..

This is a firewall issue. More than likely you had the referer check turned off before and now it's turned on. So, either the it needs to be turned off in the config file or the user's that are getting the error need to alter their firewall so it doesn't mess with the REFERER variable when on your site.