Running HP 10.20 Informix 7.24 application on HP 1

Hi we have an application that has been compiled on HP 10.20 and Informix version 7.24. The application has both thread safe and non-thread safe libraries. when I installed the application on HP 11i 64 bit platform with Informix 7.31. The portion of the application that uses non thread safe libraries to connect to Informix database is working great. The CORBA servers that use the thread safe libraries to connect to Informix database is core dumping with segmentation failure at the following code segment: sqli_connect_open(ESQLINTVERSION, 0, the_db, StrdbOpenCountlocal, (ifx_conn_t *) 0,0); The exact same piece of code is used by non-thread safe libraries and they are working good on HP 11i. Can you please advice me on what may be happening or how can I trouble shoot this problem. I was under the impression that binaries compiled on HP 10.20 would run with out any problem. Thank you for your help in advance Shankar