I downloaded version 1.2.1 on Jan 5th 2015
I was able to identify the error by enabling bug mode in the default wp-config.php file.
My error was becasue of the headers coming in too soon. The same bug in which you have responded to on https://wordpress.org/support/topic/bugfix-headers-allready-send?replies=3
I have the same inquiry, please advise with my site