Token user:reg-days shows wrong values. It shows the same values as user:login-days, which is wrong. Problem is in the file user_stats.module where this part:
case 'reg_days':
$user_access = db_result(db_query("SELECT access FROM {users} WHERE uid = %d", $uid));
$data = floor((time() - $user_access) / 86400);
should be replaced by this part:
case 'reg_days':
$user_created = db_result(db_query("SELECT created FROM {users} WHERE uid = %d", $uid));
$data = floor((time() - $user_created) / 86400);
Then it starts to work :-).
Andrej.