ILE and activation groups

Background:

I'm working with a system that has service programs that run in a named
activation group.
We have multiple library lists for different environments (different sets
of test data in different libraries) and like to switch between them.
These library list changes could include the library that contains the
service programs.
The service programs use native I/O have an "open" procedure that opens the
files (among other things) and registers a "close" procedure (closes files)
with CEE4RAGE.

I'm working on some changes to this process and we now have a CL program to
manage the library list for us when we change environments. Part of that
CL is RCLACTGRP on that named activation group.

Problem:

I'm seeing the dreaded MCH3402 Tried to refer to all or part of an
object... after RCLACTGRP and changing the library list at the point the
first program in the call stack tries to call a procedure from one of the
service programs.

Do I have the concept wrong here? What could I be doing wrong?

Thanks in advance.



---
Brian J. Garland
Vermont Information Processing, Inc.
brian.garland@xxxxxxxxxx