На почту идут письма об ошибке БД:
Database error in vBulletin 3.8.0:

Invalid SQL:

SELECT languageid,
phrasegroup_global AS phrasegroup_global,
phrasegroup_adv_portal AS phrasegroup_adv_portal,
phrasegroup_calendar AS phrasegroup_calendar,
phrasegroup_postbit AS phrasegroup_postbit,
options AS lang_options,
languagecode AS lang_code,
charset AS lang_charset,
locale AS lang_locale,
imagesoverride AS lang_imagesoverride,
dateoverride AS lang_dateoverride,
timeoverride AS lang_timeoverride,
registereddateoverride AS lang_registereddateoverride,
calformat1override AS lang_calformat1override,
calformat2override AS lang_calformat2override,
logdateoverride AS lang_logdateoverride,
decimalsep AS lang_decimalsep,
thousandsep AS lang_thousandsep
FROM language
WHERE languageid = 1;

MySQL Error : Unknown column 'phrasegroup_adv_portal' in 'field list'
Error Number : 1054
Request Date : Tuesday, September 29th 2009 @ 05:48:26 PM
Error Date : Tuesday, September 29th 2009 @ 05:48:27 PM
Script : http:
Referrer : http:
IP Address : 111.11.11.1
Username :
Classname : vB_Database
MySQL Version :

Главная страница форума не открыватеся, админка работает. Подскажите, пожалуйста, как это можно исправить

попробуй http://sqlinfo.ru/forum/viewtopic.php?id=1056

http://lmgtfy.com/?q=phrasegroup_adv_portal -- см. первую ссылку.

юзаешь vbadvanced? или ставил, а потом снес?