Found the problem. Thanks to everyone for their input. The problem is that in the chain of modules being invoked, one of them is doing a COBOL "CALL ISPLINK" with a SELECT PGM option. This distorts the enclave inheritance for the POSIX ON option for later modules in the chain.
Later modules will not pick up the POSIX ON from the main enclave module once an ISPLINK SELECT PGM(???) is invoked. Solution was to change all programs doing an ISPLINK SELECT PGM(???) to a normal COBOL CALL. Thanks again for all of your input. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html

