Are avatars in filesystem or database?
Are you getting search errors or what? What does "broken" mean?
Create a new style with no parent:
- Styles & Templates > Style Manager > Add New Style
- Parent Style: No Parent Style
- Title: Default vBulletin
- Allow User Selection: Yes
- Save
Then browse the site using that totally default vbulletin style - see if ff users still have the problem using the default style.
Maintenance > Diagnostics > Suspect File Version - are all default vb files showing up OK there? None says "unexpected contents" or anything like that?
What sort of datastore caching does your config.php file say you are using? This line here:
HTML Code:
$config['Datastore']['class'] = 'xxxx';