Crazy problem with PDFLIB 4.0.1 and PHP 4.0.6

Hi, Got a big problem with PHP 4.0.6 and PDFLIB 4.0.1. I got a script which is part of an application i wrote on a linux server (2.4 kernel) under php 4.0.5, mysql and PDFLIB 3.0.3. This script work very fine in this configuration. Today, i need to port the intranet application that use this script on an hp9000 box (hp-ux 11.00 64 bits OS), with SYBASE ASE 12 as Database server. Thirst, i got problem compiling PDFLIB 3.0.3 and PHP 4.0.5, so i decide upgrading both and i compile with success PDFLIB 4.0.1 and PHP 4.0.6 (DSO) together. When i began to test the application i got problems with one of the script that use PDF_* functions. After investigations, here is what i've found : this work well : >>> $funame = "toto"; >>> pdf_show_xy($pdf, "tutu $funame", 30, $y); but this cause the httpd process to die with this error "child pid 24308 exit signal Segmentation fault (11)" in the apache error log. >>> $funame = $row["username"]; >>> pdf_show_xy($pdf, "tutu $funame", 30, $y); the $row["username"] is extracted from the sybase database, retrieving the value of the "username" field. There is no problem with the SYBASE record because the script print $row["username"] in the html returned page too. It seems to me like a memory allocation problem ... Does anybody experience the same problem ? If anybody have an idea ... Many thanks for help. Alain DESEINE. alain@cabinfo.com