Howard:

I knew I was not clear when I hit the "Add Reply" button. What I meant is not having one selection per CASE. I understand how SELECT CASE works. What I meant was:
SELECT CASE
CASE member of some group, map some drive
END CASE

IF member of another goup, map some other drive

The second test, outside the CASE ENDCASE, seems to be ignored.

Regarding the batch. I just tested, changing the membership and got the following results:

First test, member of Mgt only
Failure on first, success on second

Second test, member of Mgt and Mgr
Success on first, success on second