It was an issue with avatar, and it’'s fixed. Now if i Clear the avatar it will be gone right away. But nickname is not updating if i change it, until i relogin, or try to add and clear avatar. Playing with avatar is refreshing toolbar in main roster window.
2.5.2
it seems that nickname change is reflecting at once only if you have an avatar set. If you dont have an avatar when nickname changes are not reflecting.