Last modified: 2011-07-14 06:29:42 UTC
Babel doesn't validate the contents of babel-autocreate-user are a valid username. The user class has support for different validity levels, including one for batch processes. Otherwise people could put things in there that aren't valid titles (for example a username containing [ or } or other characters invalid in titles, which would break links)
Fixed in r92141. I also changed it so the user doesn't create categories if he's blocked.