I'm not sure if any one else has noticed this, besides Aethien but I've seen other accounts also not showing up. Snailish is the only one besides Aethien that I remember the name of. But he is also not showing up, even immediately after posting.
Just thought I'd let you know it's not a single incident, and seemed to appear during / after the Sunday site maintainence (last week?).
Yther Ore.