lordkinjo: I've just checked your website using the credentials you've sent me and just as I said, I've found out that the plugin ZT Share is causing problems, because it forces Joomla to create the document object BEFORE the SEF routing takes place, so Joomla doesn't know yet that the document will use RSS format, so there's nothing JoomSEF could do about it. Are you sure that you used that plugin with older version of JoomSEF and RSS worked correctly?
robert2301: What exactly is your problem with latest version? As I understand from your older posts, you had problems with duplicated domains in some components with 4.2.0, so you downgraded. Have you tried version 4.2.2? And do you experience problems with RSS feeds with version 4.2.2?