[vPostMaster] can't login as superuser

[Wallace Winfrey]

I'm trying to access my vPostmaster admin control panel, and while the 
login page tells me "invalid user or password", I'm seeing the following 
error in my apache error log:

[Wed Jul 16 23:46:53 2008] [error] [client 71.218.118.122] PHP Notice: 
Undefined index:  vpm_isadminuser in /var/www/html/vpostmaster/code.php 
on line 362, referer: http://mail.canyoncable.com/vpostmaster/

For this vPostmaster installation, I'm running the free version 
(vpostmaster-1.46-1.noarch) on CentOS 5.

Is this really a wrong password? I don't think it is, as I didn't see 
any indexes named something like this, course, I might just not be able 
to read a postgres index listing:

vpostmaster=# \di
                                         List of relations
  Schema |                    Name                     | Type  |  Owner 
   |         Table
--------+---------------------------------------------+-------+----------+-----------------------
  public | adminprivs_adminusersname_key               | index | 
postgres | adminprivs
  public | adminprivs_id_key                           | index | 
postgres | adminprivs
  public | adminusers_id_key                           | index | 
postgres | adminusers
  public | adminusers_pkey                             | index | 
postgres | adminusers
  public | autoresponders_id_key                       | index | 
postgres | autoresponders
  public | autorespondersettings_autorespondersid_key  | index | 
postgres | autorespondersettings
  public | autorespondersettings_id_key                | index | 
postgres | autorespondersettings
  public | autorespondershistory_autorespondersid_key  | index | 
postgres | autorespondershistory
  public | autorespondershistory_autorespondersid_key1 | index | 
postgres | autorespondershistory
  public | autorespondershistory_id_key                | index | 
postgres | autorespondershistory
  public | domaindefaults_domainsid_key                | index | 
postgres | domaindefaults
  public | domaindefaults_id_key                       | index | 
postgres | domaindefaults
  public | domains_id_key                              | index | 
postgres | domains
  public | domains_pkey                                | index | 
postgres | domains
  public | enveloperules_id_key                        | index | 
postgres | enveloperules
  public | enveloperules_usersid_key                   | index | 
postgres | enveloperules
  public | extraattributes_id_key                      | index | 
postgres | extraattributes
  public | extraattributes_label_key                   | index | 
postgres | extraattributes
  public | extraattributes_name_key                    | index | 
postgres | extraattributes
  public | extrasettings_id_key                        | index | 
postgres | extrasettings
  public | extrasettings_usersid_key                   | index | 
postgres | extrasettings
  public | greylist_expireafter                        | index | 
postgres | greylist
  public | greylist_id_key                             | index | 
postgres | greylist
  public | greylist_sender_key                         | index | 
postgres | greylist
  public | meta_id_key                                 | index | 
postgres | meta
  public | users_id_key                                | index | 
postgres | users
  public | users_name_key                              | index | 
postgres | users
  public | usersettings_id_key                         | index | 
postgres | usersettings
  public | usersettings_usersid_key                    | index | 
postgres | usersettings

This is a production system, so if I can fix it without re-installing, 
that would be great.

cheers

w