Feedburner stopped updating; saying file too big, but it's not

[JennaHsn]

My Feedburner feed has not updated for two weeks.

http://followbenandjenna.com/feed

http://feeds.feedburner.com/followbenandenna/feed

Both original and feedburner feeds validate in feedvalidator. I have reduced my feed to just 1 post and have published a new test post composed entirely in the WordPress editor and not in Word. It shows up fine in my original feed, but I keep getting the "feed filesize is larger than 512kb" error. I have cleared my cache files AND disabled my cache plugin. Fed Medic does not report and errors. Fetching as Google does not report any errors.

What else can I do? Please help!