I stumbled onto an issue with the knowledge base. Please note: this seems to work fine with http, but not on https (I have a browser add-on that auto converts all http links to https where available). So, if I go to the knowledge base from the website menu or via Google search and then click on one of the topic links, I get a 404 error. But, if I change the "www" prefix to "kb" as the subdomain, the link works. So, I'm not sure what is involved in fixing something like this, but wanted to bring it to the CS Cart team's attention.