Description:
------------
Every so often, I get this output from my file:

<br />
<b>Warning</b>:  imagettftext(): Problem loading glyph in <b>g:\hostroot\a0007\default\wwwroot\images\button.php</b> on line <b>81</b><br />
?PNG

   
IHDR   ?      ?~?   TPLTE   ???????߿?޽?ϟ??†?d?ϟ????ٳ?ر?ӧ__G??~??m?Р???GG5vvY?̙???33&ffLLL9_??r?g"?   ?IDATx????? D?????????6iZ?Dġs
??x????&?WX,?5i???H5?|???^"$?:V??#>??D??W??X?????Y???syFj*O???	B?uf?	???HM剴????줻5??"?&"?NL????o??4
Q?W?	?|?55?'?9J戓?l?ɦ&?J???D??O4?*???KMzܟ???:?O 6    IEND?B`?


And so ofcourse, the image displays as the notorious red X in IE

Reproduce code:
---------------
<?php

define("FONTFILE", "./arial.ttf");
define("FONTSIZE", 8);
define("WIDTH", 145);
if ($_GET["bottom"] == 1) {
	define("HEIGHT", 20);
	$mod = -1;
}
else {
    define("HEIGHT", 19);
	$mod = 0;
}

$im = imagecreate(WIDTH,HEIGHT);
$black = imagecolorallocate($im, 0, 0, 0);

//This part of the code was omited because of its length. It basically is a bunch of imagesetpixel(), imageline(), and imagefilledrectangle() functions to give this button a 3d bevel.

//text
$textdata = imagettfbbox(FONTSIZE, 0, FONTFILE, $_GET["text"]);
$bbox_h = $textdata[1] - $textdata[7];
imagettftext($im, FONTSIZE, 0, 4, 14, $black, FONTFILE, $_GET["text"]);

imagepng($im);

?>

Expected result:
----------------
Most of the time this works, but it randomly gives the error described above.
This problem only occurs on PHP 4.3.2 and worked fine under 4.2.3.