There seems to be a problem with the View all users search page, here in the forums.
I'm not able to find myself using this page - not using wildcard search, nor using my exact username.
It could be a problem because of the @ in my username, I'm not sure. But you should get your webmaster/-team to take a look at this.
(I'm not in the habit of searching for myself here, but I was searching for another user who turned out to have a @ in his username - and he couldn't be found either)