spectrus on "[Plugin: W3 Total Cache] non-secure feedburner URLs in wp-admin?"

Just moved my site over to HTTPS, but the WordPress dashboard still loads as partially encrypted, due to the three URLs that look like this:

http://feeds.feedburner.com/~r/W3TOTALCACHE/~4/cYuAhRhNbPI


Tried modifying the W3TC_FEED_URL constant inside inc/define.php, to no avail. Where are these URLs coming from?

Thanks.

http://wordpress.org/extend/plugins/w3-total-cache/