pg_group problem

Not sure what's going on but I have a problem using pg_group after creating a
group:

testschemas=# select * from pg_group;
 groname | grosysid | grolist 
---------+----------+---------
(0 rows)

testschemas=# create group testgrp_1 user foo,bar;
CREATE GROUP
testschemas=# select * from pg_group;
ERROR:  cache lookup failed for type 2139062143
testschemas=# select * from pg_user;
 usename  | usesysid | usecreatedb | usesuper | usecatupd |  passwd  | valuntil | useconfig 
----------+----------+-------------+----------+-----------+----------+----------+-----------
 software |        1 | t           | t        | t         | ******** |          | 
 foo      |      100 | f           | f        | f         | ******** |          | 
 bar      |      101 | f           | f        | f         | ******** |          | 
(3 rows)

testschemas=# select * from pg_group;
ERROR:  cache lookup failed for type 2139062143

What's that all about?

Stopping and restarting the backend doesn't make the select of pg_group work,
unsurprisingly.

Okay, narrowed it down to adding users to a group I think. In a fresh build
and install from anoncvs:

testschemas=# create group mytest_grp;
CREATE GROUP
testschemas=# select * from pg_group;
  groname   | grosysid | grolist 
------------+----------+---------
 mytest_grp |      100 | 
(1 row)

testschemas=# alter group mytest_grp add user foo;
ALTER GROUP
testschemas=# select * from pg_group;
ERROR:  cache lookup failed for type 2139062143


Is this something to do with the recent changes to array_in/out perhaps?


-- 
Nigel J. Andrews
Director

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Logictree Systems Limited
Computer Consultants