Post problem after delete code in config.php

I direct to an empty page after I post a new entry or edit an entry. Before this I delete some code in config.php due to the chinese fonts display problem after I upgrade to wp 2.2.2.

code deleted :
define(‘DB_CHARSET’, ‘utf8’);
define(‘DB_COLLATE’, ”);

It direct to an empty page which addressed with https://kailoon.com/wp-admin/post.php

Thanks!