It looks like possibly that this post (http://www.epmchannel.com/2012/06/08/social-business-what-are-companies-really-doing/) is a indication of the error. In particular the headline part to the right of the image although I can’t be 100% sure.
If you look at that page in the editor in Visual/HTML tabs do you notice any weird symbols/code?
I took out a long dash, but there’s still an error showing up. I didn’t see any weird code.
I checked your feed in a validator – http://validator.w3.org/appc/check.cgi?url=http%3A%2F%2Fwww.epmchannel.com%2Ffeed%2F
It shows where the current issue is happening. From a quick read of the help link it appears as though your feed isn’t receiving the proper encoding which is causing the errors.
If you log into your admin area and go to Settings->Reading, what is displayed in the ‘Encoding for pages and feeds’ input box? If it is something other than UTF-8 that might be the cause of your issues.