For around a week now, many Blogger users have experienced Bx-error codes when attempting to upload a new template to their blogs when previously these templates had worked just fine. I discovered the reason for this on the Blogger Help Group after reading this post from Gatsby, a Blogger Employee: Recently we changed the way our template editor accepts certain third party code, so that it is now less tolerant of certain templates. We did this because we had seen a lot of data corruption due to 'bad templates,' and we are trying to stave off some of these issues pre-emptively. Now we realize that this has caused some inconvenience to folks, so we are re-thinking our decision and will post an update on that shortly. At the time of writing this post, I have not found any notification that this issue has been fixed, and many of my own custom templates do not work in their initial state (I'll explain the fix later in this article). Since there are so many bloggers compl...