I have a custom installation. When i open "Moderate Users" in Adminmenu, i become this on site 1:
id username no. of messages options
undefined null undefined unban banned
undefined null undefined ban banned
undefined null undefined ban banned
undefined null undefined ban banned
undefined null undefined ban banned

on page 2:
id username no. of messages options
14 undefined 0 ban
14 undefined 0 ban
14 undefined 0 ban

when i switch back to site 1:
id username no. of messages options
14 undefined 0 ban
14 undefined 0 ban
14 undefined 0 ban
14 undefined 0 ban
14 undefined 0 ban

id14 is the last id number in the database for the users of the cms.

i use a cms (dzcp.de), the correct data i wrote in the arg.php:
/* if you are using database table to store User details */
$usertable='users'; //specifies the name of the table in which your user information is stored.
$row_username='nick'; //specifies the name of the field in which the user's name/display name is stored.
$row_userid='id'; //specifies the name of the field in which the user's id is stored (usually id or userid)

in the chat, i become the correct nickname, so the data are ok.

We are sorry but we forgot to integrate the moderate users with the Custom driver . We will make the required changes as quick as possible .

Your problem is now solved in the new version i.e 7.4 .