Last modified: 2008-12-23 00:34:13 UTC
The Offender field in the Oversight UI does not understand that an underscore is equivalent to a space, so "Some_User" returns no results when "Some User" does. The Oversighter and Title fields do treat '_' = ' '. As a result, the recently added link from user contribs (bug 16380) fails when the username has a space in it.
Fixed in r44920.