[diim_nowa]

In \admin\read_pms.php

Find:

//print_label_row('To', htmlspecialchars($pm['touserarray']));
$to = is_array(unserialize($pm['touserarray'])) ? implode(", ", array_values(unserialize($pm['touserarray']))) : null;
$to = ($to == 'Array') ? htmlspecialchars($pm['touserarray']) : $to;
print_label_row('To' , $to);

Replace that with:

$myarray = array_values(unserialize($pm['touserarray']));
if (is_array($myarray[0])) print_label_row('To' , htmlspecialchars(implode(", ", array_values($myarray[0]))));
if (is_array($myarray[1])) print_label_row('BCC' , htmlspecialchars(implode(", ", array_values($myarray[1]))));

Whether and it is impossible except name to add the user and it ID?