Since Google took over the FeedBurner, it hasn't worked out very well for everyone. Unfortunately, it affected us too, we lost our old account for the RSS feed. We can't log in to our account to manage the feed anymore.
So, we have to open a new account and create the feed again.
If you subscribe to our blog via RSS, PLEASE re-subscribe it again from our bottom right link "Get updates via RSS".
Sorry for the trouble, and thank you for your understanding.