This is the first time I'm having this problem and I came across the following on the blogger known issues website.
Monday, December 12, 2011
Some users are reporting bX-l4u1mh when editing the Layout of their blog. We're investigating the issue and will report back as soon as we have more information.
Thanks for your patience.
Thanks for your patience.
go to http://knownissues.blogspot.com/ if you encounter the same problem.
