mcrypt: generic_init failed

Hi, Our website uses mcrypt functions to encrypt and decrypt passwords stored in the PostgreSQL database. The website encrypted/decrypted passwords flawlessly under PHP 4.0.4, however, we recently upgraded the server that the website is stored on to PHP 4.2.3. Since then, each time a password is encrypted/decrypted using any of the mcrypt-functions, the following error displays even though the code was untouched: Fatal error: generic_init failed in /home/httpd/html/domainsunderdevelop/include/class.databaseconnection.php on line 498 Line 498 on class.databaseconnection.php is: $NewString = mcrypt_cbc( $this->CIPHER, $this->KEY, $RawString, $Mode, $iv ); We installed libmcrypt 2.4.9 after upgrading PHP to 4.2.3. If you have any suggestions or ideas, please let me know. Thanks in advance, Adelaide