RSS feed broke – space before XML declaration

In the last 24 hours, suddenly my feed broke. I didn’t touch any feed files, add any plugins or anything like that. It just stopped. I use Feedburner and the Feedburner plugin. Here is the error:

http://feedvalidator.org/check.cgi?url=http%3a%2f%2fwww.maroonedcomic.com%2ffeed%2f

I cannot figure out where to go in my files to fix this. Somehow a space got added somewhere and I have no idea where.

Any help is greatly appreciated, I have an important update tomorrow, I’d hate to lose readers.