The replay with no name added the other day was mine. It seems to me the problem occurs when you're logged in for a longer time and the site has been unstable in the time in between login and posting.
That's fixed: if it happens now, you'll get a message asking you to login again. Also, if one ticks the "Remember me" box on the login page, the session never expires¹.
Also there are some other problems: 1) When you click on a pipsqueak to the profile (and past results) the site makes an error. 2) Secondary positions doesn't appear on the pipsqueak profiles. For instance; the results of Böller and Rokker on the last track doesn't appear on the pipsqueak profiles. 3) The car is replaced with a text in the newbie league. 4) The car graphics under the scoreboard overlaps. CTG's car has three wheels. ;-)
1) and 3) should be fixed. No idea about 2) though.
Also, the nickname issues where related to the upgrade, they're gone now  It actually expires, but it's magically reopened without anyone noticing.