So yeah,do any of you here also participate in AnimePaper?Because,well,can you log in or even just view your own userpage?Cause,I can't.And no matter who's userpage I open it says "This user doesn't exist"...So anyone?...

Yes I had this same problem

I see,does anyone know what is happening there?...

Yep im experiencing the same problem. Perhaps v6 may be getting released. I dunno.
I thought i was banned at first lol.

Seriously this is not AP. If your having an issue with that site go take it up with the mods and admins there. They would best be able to tell you what's happening.