After logging in as admin, the username that appears in menus and in the 'User settings' page is 'superUserWasSet'.
I don't recall this happening prior to v2.8.2 (but I didn't check v2.8.1). Is it a regression or by design? Seems a bit weird..
Seems to be related to this commit https://github.com/piwik/piwik/commit/d59a45092b0555cbe6bd670ce5a578ce44c0af4a