Blogger.com is addressing the issue of bx- error codes
Although you should get a prompt when you get the error code screen prompting you to report the error code to the Blogger staff, a lot of people are still posting to the blogger message boards instead of reporting it to Blogger.com.
So I'm guessing that the Blogger.com staff have seen all of these postings and have decided to take it a bit further by providing an additional source of help.
According to the Blogger employee you can now report your error code problems by going to this link. That way when you report your error code problems it will let them know of it so that they can work on solving it.