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Same happened to me. What it looks like to me is that the site is now referring to users by Real Name instead of Username. A quick fix is to edit the database directly and make everyone's username and real name the same - it's a dirty hack I grant you, but it at least looks better than a bunch of blank space.
As an aside - I'm interested in using the nightly build to see if some of my RC issues have been solved, but I can't figure out how to do it. The download conatins just one very large file that is a concatenation of all the site files - how does the engine process that? Or have I grabbed the wrong file?
Anyone know?
Cheers.