Problem with accented word and attachment

[mc0676]

He guys, here some informations about my problem:

vBulletin Version:
4.2.2

PHP Version:
5.3.3

MySQL Version
5.1.71

Any Addons installed
Auto Purge Threads
Ban individual users from sending pm, emails and v
Chiplove.9xpro - Thread Thumbnails
CompletevB - Theme Manager
DragonByte Tech: Advanced User Tagging (Lite)
Easy Forms
Enables custom CSS to be used by Matt
Exclude Forums from What's New/FORUMHOME
Extended reputation display
Force Users to Read a Thread
Forum Runner
GlowHost - Spam-O-Matic
Hasann - Sub-Forum Manager
Inactive and Lurker Members
iTrader
Mark Thread As 'Solved'
Metro Theme Management
MGC Chatbox Evo
Miserable Users
Multiple Account Detection & Prevention
Navigation Manager Enhancements
Panjo
Post Thank You Hack
PostRelease
Reply to All - PM
Skimlinks Plugin
Spiders Display on Forumhome and Who's Online
Tapatalk
vBSEO :: Sitemap Generator
VSa - Advanced Forum Statistics
VSa - PayPal Donate

Does the issue occur in a default style?
YES, it do.

Error message on the screen':
I do not receive any errors.
The problem is that starting from yesterday some of strange happens to my vb:
- accented word (like ?) are not correctly visibile under firefox and under chrome but i can see in ie;
- attachments stop workd with any browser: when i try to attach a file this was uploaded and after i receive a red point "undefined";
- old attachment are not visible.

Browser and Browser version used:
chrome, ie and firefox

A list of steps that can be used to recreate the issue:
Simple u can navigate the forum and check the problem.
Here the home page with the default style:
http://www.esigforum.com/forum/index.php?styleid=36

U can choose a "stock" style ad the bottom of page.
U can check the attachment that not works here for example:
http://www.esigforum.com/forum/showt...7845-SquallBox

I've tried to use disable_hook of course but without success.

And the strange is that i've no edit something in my board.
Problem appairs without no change in admin panel.
I've reupload original vbulletin files and i've upgraded again but without solve my problem.

Thank u for support.