A few days ago our subscribers stopped receiving their emails, and I discovered that our RSS feed is broken. Here is the error I receive when I go to http://www.keysmashblog.com/feed :
XML Parsing Error: XML or text declaration not at start of entity
Line Number 2, Column 1:<?xml version="1.0" encoding="UTF-8"?>
I looked at some of the other threads where people seemed to be having similar problems, and tried the solutions that I understood - I deactivated all of my plugins, but the feed remained broken, so they are now reactivated. I uninstalled and then reinstalled Twenty Eleven. We are using a child theme to give us a custom header (code copy and pasted from threads here on the forum because we're not programmers ourselves). I tried using the fix-rss-feed plugin, but the feed is still not working.
What else can I try?