I'm setting up a new site, and I've used wpDiscuz on other sites without problems, but for some reason, the plugin is refusing to except the character "S" (lower or upper case) in the comment field.  I'll type it, and it simply won't show up.  I haven't added anything to the site's content moderation filters, and this does not occur with the default WordPress comment field.  I'm pulling my hair out trying to figure out what the problem is.  Any help at solving this would be appreciated!