Again, Segfault with Aolserver, PHP, SquirrelMail

Hello, No one seems to want to touch this, not on the Aolserver list, not on the PHP list, not on the SquirrelMail list. However, I'm going to try again. On a server running RedHat Linux 7.2, I've got Aolserver 3.4.2 compiled and working fine, and PHP 4.0.6 compiled as a module and working fine except when it segfaults. It occurs consistently when loading SquirrelMail's (1.2.0-rc2) src/right_main.php, though I think the problem is really in the called function sqi_mailbox_list from functions/imap_mailbox.php. Exactly what the server is trying to do when it crashes I haven't yet figured out. The PHP source distribution warns about trouble with multi-threaded servers, but the suggested workaround, removing a line of code, refers to a line that no longer appears to be in the code anyway. Has anyone had a similar problem? Can anyone help me solve this problem or debug it more accurately? I currently have Aolserver 3.0, SquirrelMail 1.0.6, and PHP 4.0.6 running with no problems on another server under RedHat 6.2 (I'm trying to migrate our webmail onto a new machine) so this is very frustrating. Thanks. Sean Redmond Brooklyn Museum of Art