Problem with non latin characters

When i store this: ğ ü ş ç ö ı . in a post, you will see this: ğ ü ş ç ö ı .

When i store this: ğ ü ş ç ö ı . in my db table (via $wpdb->prepare()), you will see: ? ü ? ç ö ? .

The above in the same wp installation.

I verified with js alert() that i get the correct data via $_POST.
If i ommit prepare() and put it raw into an update query, the result is also wrong.

My plugin is wp-photo-album-plus, The db tables are as follows:

$create_albums = "CREATE TABLE " . ALBUM_TABLE . " (
                    id bigint(20) NOT NULL auto_increment,
                    name text NOT NULL,
                    description text NOT NULL,
                    a_order smallint(5) unsigned NOT NULL,
                    main_photo bigint(20) NOT NULL,
                    a_parent bigint(20) NOT NULL,
                    p_order_by int unsigned NOT NULL,
					cover_linkpage bigint(20) NOT NULL,
                    PRIMARY KEY  (id)
                    );";

	$create_photos = "CREATE TABLE " . PHOTO_TABLE . " (
                    id bigint(20) NOT NULL auto_increment,
                    album bigint(20) NOT NULL,
                    ext tinytext NOT NULL,
                    name text NOT NULL,
                    description longtext NOT NULL,
                    p_order smallint(5) unsigned NOT NULL,
                    PRIMARY KEY  (id)
                    );";

    require_once(ABSPATH . 'wp-admin/upgrade-functions.php');

    dbDelta($create_albums);
    dbDelta($create_photos);

The fields afected are: name and description.

What do i do wrong?

I checked all possible character manipulating and escaping routines but could not find anything that converts multi-byte UTF-8 to &#12345 or something like that.

Please help me supporting my Turkish users…