Centera interface FPZSTUB hangs when executed from an APF lib on z/OS

Hello,

First please let me apologize if I have selected incorrect software, this is a first for me!
The problem we are having is as follows: we use the Centera SDK version 3.1.477 with our application in IBM z/OS 1.9 environment. When the SDK library gets APF-authorized, we are experiencing a "hang" in FPZSTUB when initializing the Centera interface. The specific call I believe is FPPool_GetPoolInfo, which causes an implicit FPPool_Open in FPZSTUB.

9 Call FPZSTUB n/a n/a M+31C Not determined
10 Call LSCSGNL n/a n/a M+2316 Not determined
11 Call LSCSGNL n/a n/a M+52C8 Not determined
12 Call LSCSGNL n/a n/a M+4AC6 Not determined
13 SVC LSCSGNL n/a n/a M+4EE6 Not determined
14 Call IGC0101C n/a n/a M+12976 LPA

That call never completes causing eventually the job to be terminated with abend S522.

I attempted to enable SDK logging be means of an FPCONFIG DD but nothing came out.

Would you be able to offer any advice?

Thanks,
Greg