Has the Newsstand RSS feed ever worked?
Whenever I subscribe to the feed, my RSS reader immediately appears to be up to date, but as the Newsstand updates, my feed reader never stays in sync. Basically, it appears as though there’s something wrong with how the feed updates feed readers, at the very least w/r/t my choice of readers (both the Mac and iPhone versions of NetNewsWire).
Not knowing anything about the RSS specification, or how your CMS publishes feeds, I’m not sure I can point to a specific thing. The feed does validate, but not without warning(s). I’ll be sure to check if this problem exists elsewhere (I’m currently playing around with Google Reader), but it’d be great to know if this is something anyone else has ever encountered.