Hello.
I got 2 problems (or just can't understand how) to use tagging people in status-messages and replayes.

1. Can't tag people in status-messages.
2. In Reply for status messages can tag only usernames with English RealName. If I try to tag some russian name:
@Тёма
@Исаак Слепой
it starts to display other users with another english realnames. Or doesn't display nothing.

I can tag in Reply any site members, or only user that posted status or Replyed to status like me?

Hi, SleepyMan.

1. This is caused by your template - switch to default Joomla! template -> Atomic and you can tag user (only with latin characters). Try with @support (you need to write it not copy).

2. This seems to be a bug. Post box doesn't perform search for non-latin characters. But pleas check it on default Joomla! template. It's hard for us to check it as we don't have Russian keyboards...