Forum code(1) : eval()'d code on line 3

[محروم.كوم]

Hi,

my vbulletin 4.0.2 forum (przepieknie.pl) is down since 7th of January and I failed fixing it. I hadn't have any changes or updates before it happened.There is an error:

"Parse error: syntax error, unexpected T_STRING, expecting ',' or ';' in /home/maciejw/public_html/includes/class_core.php(4015) : eval()'d code(1) : eval()'d code on line 3"


At first I was recieving report about SQL errors every time someone tries to enter my site:
mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
/home/maciejw/public_html/includes/class_core.php on line 313

Now I am get reports about this error:
Database error in vBulletin 4.0.2:

Invalid SQL:
SELECT tagid, tagtext, canonicaltagid, dateline FROM tag WHERE tagtext = 'złuszczanie';

MySQL Error : Illegal mix of collations (latin2_general_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation '='
Error Number : 1267

What I have tried (found on Internet):
1) I have added line to config.php file: PHP Code:
define('DISABLE_HOOKS', true); - bez zmian

2) I have overwrite class_core.php
3) exporting & importing styles table

I am looking forward for some more advice. __DEFINE_LIKE_SHARE__