It was a plugin after all – Smart Tags – Once disabled the feed is working again.
Similar problem for me and feedburner can’t find them either… It is as if there are things that are added or deleted as you add plugins or something that cause it to be broken. At http://www.projectspossible.com – My site with the RSS problem… I have tried deactivating all of the plugins, reuploading all of the php files, and I still have the problem… Mine is a bit different because my browser eventaully tells me that I have a Feed Error Code.
I believe the correct links are:
http://www.domainname/feed for the Entire RSS and for the comments it is http://www.domainname/comments/feed
