Segmentation Fault with Oracle / oci8.php

Hi list, perhaps on of you can help me to solve this: i'm using php 4.0.6 with apache 1.3.19 on linux (kernel 2.2.1x). When I turn off autocommit, and try doing an insert statement (which could have an error, but that shouldn't be the problem) with simple_query, php hangs when it tries to do OCIExecute($sql, OCI_DEFAULT)... Now I'm not sure what EXACTLY i am doing wrong, 'cause without it seems to work (more) properly. I still get seg faults quite often, but at least the script runs and shows output and segfaults only on exit, it seems. Anyone any idea? (I did google about that segfault thingie and found some posts to this list from betrand on nov, 6. but couldn't find any answers to them yet) TIA Karsten