Hi tomas
>> When I click on mass mailing i have total members:480 (but really i have 503 users)
Mass mailing shows only members with verified email
For example:
I have 50 users on my demo site. One of them has unverified email.
So when i go to the mass mailing page, i see 49 users.
Please, check do you have users with unverified email on your site.
>> i select something from users filter i have total members :0.
User filter works like oxwall user search.
If you select value of a field on users filter and on your site you haven't users who filled this field, you will see "total members :0"
For example:
On my demo site I have on required field Gender.
I have only 12 users who filled this field, so
you can check this on user search page