Error 404 on users and user profile tabs

Hey guys, great job on a plugin!

I faced and two issues after clean installation:

1. Whenever I want to check any user profiles, i get error 404.

Here is a link structure for profiles:
http://www.clubpap.ru/questions/user/Sabotage
http://www.clubpap.ru/questions/user/Support

2. I can see my own profile homepage, but whenever i try to click any tab on profile page, i get error 404.

Page slugs are:

Users page = “Community”
User page = “Profile”

What did i do wrong? 😀