The users who show up Bold Italic in "Last Seen" are invisible. I think admins are the only ones to see those users.
I've noticed that sometimes with the shoutbox too.
What usually happens, is someone posts some long string of text somewhere, like "lololololololololoolllolololol" and it blows the box out of wack. It usually goes back when I delete it. Usually the shoutbox is in a narrow column to begin with, so it doesn't take much to make it scroll.
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