Yesterday I noticed my RSS feeds weren't working, so I went through the exercise of deactivating all my plugins and turning them back on one at a time. They work fine with everything but "Organize Series" activated. With it activated I get an RSS formatted 404 Page Not Found page. My comment RSS feed returned the contents that should have been in my regular RSS feed, but no comments.
Deactivating OS, everything goes back to normal. I can repeat the issue by reactivating, and deactivating again clears it up.
Any help, or instructions on how to downgrade, would be greatly appreciated.