owner of data type "areas" appears to be invalid ?

[PostgreSQL 7.4RC2, x86 linux]
Several tables are giving the errors like:
pg_dump: WARNING: owner of data type "areas" appears to be invalid
from pg_dump.

This is my production database, (50 users, 18 hours/day, 21MB compressed dump).

The output of "pg_dump -t areas" starts with:

REVOKE ALL ON TABLE areas FROM PUBLIC;
REVOKE ALL ON TABLE areas FROM geoyou;
SET SESSION AUTHORIZATION "101";
GRANT ALL ON TABLE areas TO "101" WITH GRANT OPTION;
RESET SESSION AUTHORIZATION;
SET SESSION AUTHORIZATION "101";
GRANT ALL ON TABLE areas TO PUBLIC;
RESET SESSION AUTHORIZATION;
GRANT ALL ON TABLE areas TO PUBLIC;

But "101" is the numerical group id of the "operator" group! (see dump from pg_group below). The table owner is "geoyou" as seen from the pg_class select below. User "geoyou" is in pg_user with usesysid=501. There is no row in pg_user with usesysid=101, and there is none with usename "101".

How can I fix this? I must be able to get clean dumps that can be reloaded in case of a crash.

-- George Young

pig5=> select * from pg_class where relname='areas';
relname | relnamespace | reltype | relowner | relam | relfilenode | relpages | reltuples | reltoastrelid | reltoastidxid | relhasindex | relisshared | relkind | relnatts | relchecks | reltriggers | relukeys | relfkeys | relrefs | relhasoids | relhaspkey | relhasrules | relhassubclass | relacl
---------+--------------+----------+----------+-------+-------------+----------+-----------+---------------+---------------+-------------+-------------+---------+----------+-----------+-------------+----------+----------+---------+------------+------------+-------------+----------------+---------------------------------------
areas | 2200 | 14745246 | 501 | 0 | 14745245 | 1 | 41 | 14745247 | 0 | f | f | r | 2 | 0 | 0 | 0 | 0 | 0 | t | f | f | f | {101=a*r*w*d*R*x*t*/101,=arwdRxt/101}

pig5=> select * from pg_user where usesysid=501;
usename | usesysid | usecreatedb | usesuper | usecatupd | passwd | valuntil | useconfig
---------+----------+-------------+----------+-----------+----------+----------+-----------
geoyou | 501 | f | f | f | ******** | |

select * from pg_group where grosysid=101;
groname | grosysid | grolist
----------+----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
operator | 101 | {602,616,509,525,614,514,617,539,517,558,581,567,506,609,94,511,573,17115,327,17422,512,537,626,503,519,583,547,570,584,78,10980,518,557,564,528,546,592,599,613,510,513,536,554,500,530,594,608,524,17114,533,17116,17289,17290,17292,17294,17345,17347,17421,17423,17425,214,17430,17427,17428,574,11,391,17431,17667,17703,8309,17769,17842,17773,17874,17877,13283,12758,17966,18888,17902,18099,18117,18129,18170,18173,18163,32766,18195,18202,18208,17786,17704,18375,18322,18399,18410,17904,18438,18424,28424,18437,102137,9877,502,32768,18553,13065,10681,8245,17049,15885,15886,8977,18706,18717}

select * from pg_tables where tablename='areas';
schemaname | tablename | tableowner | hasindexes | hasrules | hastriggers
------------+-----------+------------+------------+----------+-------------
public | areas | geoyou | f | f | f

--
"Are the gods not just?" "Oh no, child.
What would become of us if they were?" (CSL)