In the upper right corner there's a little up or down arrow. It's white against the pale blue so not 'in your face' but certainly visible if you look. If you don't see your name, avatar, thread info, etc. it's probably pointing down. Click it. Now it should be pointing up and that info should be back.
Incidentally, did you recently re-do your signature? If you did NOT use the author signature, please re-do it using that tool -- as it is, it's way too big. If you did use the tool, let us know, because something's broken: the tool isn't supposed to let it get that big!
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