5592
I found a bug in formselectuser.php
line 76:
$value = is_array($value) ? $value : (empty($value) ? array() : array($value));
This creates always an array, also if you give one single specific user id, which should be preselected in a list of all users
the line 77
if (count($value) > 0) {
creates then a dropdown with only the one, which should be preselected
the line 77 must be changed to
if (count($value) > 1) {