Feedburner not updating wordpress feed.

Have had another bout of feedburner issues. Had issues with the https://feedburner.google.com/fb/a/ping –

Your Ping resulted in an Error “We were unable to process your ping. You must ping with a URL that exactly matches the channel link (RSS) or alternate link (Atom) in your top level feed element pointing back to your website (e.g http://myblog.blogspot.com/), or use your feed URL (e.g. http://feeds.feedburner.com/myuri).”

http://feedvalidator.org/ seems to have a problem or two, as well:

This feed is valid, but interoperability with the widest range of feed readers could be improved by implementing the following recommendations.
Feeds should not be served with the “text/html” media type [help]

line 23, column 0: content:encoded should not contain iframe tag (3 occurrences) [help]
<iframe src=”https://www.youtube.com/embed/tkp_DhiPVP4″ width=”560″ height=” …

Solution

1) Tried removing all plugins. The first error went but not the second one.

2) Tried reinstalling wordpress again. No luck.

3) Reset permalinks:

Go to WordPress settings > permalinks > (set to) default > (then set back to) month and date.

4) Resync’d after all this. No luck. Still feed problem.