[Andreas]

Every time you define a new column in the user table, you have to define it in the class_dm_user.php file as well.

This is not true.

Hookname: userdata_start

PHP Code:

$this->validfields['mystrfield'] = array(TYPE_STR, REQ_NO);
$this->validfields['myuintfield'] = array(TYPE_UINT, REQ_NO);