A Strange Problem With Special Characters

[blue7]

Hello,

I am facing with a strange problem that i can not solve since 1 month. Everything started right after i upgrade my php version from 5.3 to 5.5 for update vbulletin from 4.2.2 to 4.2.3

Problem is some special characters and letters in some different languages (like Russian, Polish etc..) looks not right. Here are few examples:

?„? --> ?
?€? ---> ?
?€˜ --> ?
Ğ?Ğ??€ --> мир
?šwiata --> Świata

My forum charset is ISO-8859-9 because my forum is Turkish. Database collation is latin1_swedish_ci

when i run this query though phpmyadmin SHOW VARIABLES LIKE 'char%' i am getting this result:



Before upgrade vB i have full backed up and after this problem i restored it back but still i have this strange problem. I think something is about php version but i am not sure.

I've created support ticket on vbulletin.com but no one care or answer. I've tried many things but so far no any solution.

I hope someone here could help, thank you in advance.