1- Disable all of the products/plugins by adding
Code:
define('DISABLE_HOOKS', true);
after
in
Code:
/includes/config.php
file, and see whether it works.
2- Check some phrases in AdminCP/ Phrases and Language / Search in phrases to see whether phrases and variables are translated correctly or not.
3- Re-upload the fresh vBulletin files (exclude images and install folder and config.php.new file) and check again.