If you're receiving the error BX- on your blogger account don't panic. The problem is on the developer's end, and they are working on it. Report the problem on the Blogger Discussion board: https://groups.google.com/group/blogger-help/topics
Report the error code at: https://spreadsheets.google.com/viewform?key=pDGYK68-cO4sA0J2wa9fYBQ
Blogger will probably not contact you as a result of you reporting the problem, but it Blogger gets enough reports then will assign someone to take care of the issue.
Compare your BX- error code with others: http://bx-errorcode.blogspot.com/