I upgrade 6.005 to 6.1.2 and have this errors

I have 4 problems - if anyone can help me ...

In news I have this _day_of_6 _day_of_5 etc where Date if is problem in language please write to me what lines I need to put in language file.

Now all user is featured in home page ... but only few members I put in featured.

In groups I see this error :
Fatal error: Class 'BxDb' not found in /home/rela2/public_html/groups/orca/classes/DbForum.php on line 33

I need to only registrad user see see more the profiles - in version 6.005 I put one true in one line but I not find where need to change in profile.php - anyone can help me ?

Can see here :

http://www.rela2.senior.eti.br/index.php

Thanks