v6.4.2 backend crashing on certain sql stmts

Hi,
I've been running v6.4.2 for a while, and it's been running great.
Recently I destroyed my database and recreated them(i wanted to change
some fields).

This is on Linux 2.0.35 i386.

Now I get this error, but only on certain statements:
pqReadData() -- backend closed the channel unexpectedly.
        This probably means the backend terminated abnormally before or
while processing the request.
We have lost the connection to the backend, so further processing is
impossible.  Terminating.

My tables:
Database    = customers
 +------------------+----------------------------------+----------+
 |  Owner           |             Relation             |   Type   |
 +------------------+----------------------------------+----------+
 | postgres         | currentuser                      | table    |
 | postgres         | currentuser_id_seq               | sequence |
 | postgres         | currentuser_pkey                 | index    |
 | postgres         | memberaccess                     | table    |
 | postgres         | memberaccess_id_seq              | sequence |
 | postgres         | memberaccess_pkey                | index    |
 | postgres         | members                          | table    |
 | postgres         | members_pkey                     | index    |
 +------------------+----------------------------------+----------+

This is a normal query:
customers=> select * from memberaccess;
id|memberid|access
--+--------+-----------
 1|       1|parts
 2|       1|mcrd
[snip - normal info]

Another normal query:
customers=> select * from members;
[snip - normal info]

This is the query that breaks:
SELECT memberaccess.access
            FROM memberaccess
            WHERE memberaccess.MemberID = members.ID
              AND members.username LIKE 'gjerde';

This last query will give the error message on top.
The sql statements to create my tables are below.

Thanks,
Ole Gjerde
System Administrator
Avsupport Inc.


CREATE TABLE members (
        ID              int4 PRIMARY KEY,
        username        varchar(64) NOT NULL,
        password        varchar(64) NOT NULL,
        companyname     varchar(128),
        contact         varchar(64),
        phone           varchar(32),
        fax             varchar(32),
        email           varchar(64),
        contactby       varchar(16),
        datecreated     int8 NOT NULL,
        status          varchar(32),
        demodaysleft    int4,
        lastlogintime   int8,
        concurrentusers int4,
        searchnum       int8,
        rfqnum          int8,
        loginnum        int8
);

CREATE TABLE memberaccess (
        ID              serial PRIMARY KEY,
        memberid        int8 NOT NULL,
        access          varchar(32) NOT NULL
);