There seems to be a problem displaying certain usernames.  It's not necessarily length related, it may have to do with having non-alnums in the username. I'm not sure.

create a user named "user-1" or "test username" or something like that (no quotes).

Then, log in and look at the username display in the top right of the gui. I saw both of these span two lines and mess up the menu bar.  

Note that "testausername" did not wrap.

I saw this on IE10 and Chrome.