Ah, ok. That plugin hasn't been updated in almost 5 years and is only compatible up to WordPress 3.0.5, so I wouldn't put too much faith in it having any relation to diagnosing the problem. :)
Your feed is perfectly valid: http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Frichsride.org%2Ffeed%2F
And the latest post in your feed is http://richsride.org/2015/05/a-repeat-message-about-choices/ posted May 14th, so it would appear that the issue is on Feedburner's end, and I recommend getting in touch with them about this.