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
[1] It actually expires, but it's magically reopened without anyone noticing.