Problem with TTF file

Hi All,

I am having major problems with a PHP script that generates barcodes
as PNG image. It is currently running without a problem on a website
with an old version of Debian. However, now that I am moving the site
to a new server, the script stops working. The function is pretty
basic:

function create_image() {
   header('Content-type: image/png');
   $box = ImageTTFbbox($this->fontsize, 0, $this->fontfile, $this->article);
   $src_img = ImageCreate(($box[2]+11), (abs($box[7]-$box[1])+6));
   $black = ImageColorAllocate($src_img, 0x00, 0x00, 0x00);
   $white = ImageColorAllocate($src_img, 0xff, 0xff, 0xff);
   ImageFill($src_img, 0, 0, $white);
   ImageColorTransparent($src_img, $white);
   ImageTTFText($src_img, $this->fontsize, 0, 3, abs($box[7]), $black,
$this->fontfile, $this->article);
   ImagePNG($src_img);
   ImageDestroy($src_img);
}

Details can be found at 'phpclasses.org slash browse slash file slash
17681 dot html'.

The problem is that the function only fails for one certain truetype
file, the one that has the barcode in it. As a result, I get a bunch
of the rectangles for each character, as it does for any character not
in a character set. If I use any other truetype font, it displays ok.
So, as a conclusion, there is a problem with the font. But than again,
I use this font file for several years now.

The GPL font file I use can be downloaded from 'grandzebu dot net
slash informatique slash codbar slash ean13 dot ttf' and the string to
put in $this->article for testing is 3FJQRLA*cbgahj+

I assume the problem is a mix of a problem both within GD and in the
fontfile, even though the font works on any Windows or Linux GUI. Does
anyone know how to find out what is causing this, or even better how
to fix it again?

The old (working) server: Apache/2.0.54 (Debian GNU/Linux)
PHP/4.3.10-16 mod_ssl/2.0.54 OpenSSL/0.9.7e mod_perl/1.999.21
Perl/v5.8.4. GD Version: 2.0 or higher .
The new (not so working) server: CentOS release 5.2 (Final) Linux
2.6.18-92.el5 #1 SMP. GD Version: bundled (2.0.34 compatible).

Any other details required?

Thanks in advance,
Marco