yeah, unfortunately a change in 5.4.1. broke it… its already fixed for next version…
if you want to fix it yourself, you can edit simple-press/admin/panel-users/forms/spa-users-members-form.php and change
<form id=”posts-filter” name=”searchfilter” action=”<?php echo SFADMINUSER.’&form=members’; ?>” method=”post”>
to
<form id=”posts-filter” name=”searchfilter” action=”<?php echo SFADMINUSER.’&form=member-info’; ?>” method=”post”>
and change
‘base’ => ‘admin.php?page=simple-press/admin/panel-users/spa-users.php&form=members&%_%’,
to
‘base’ => ‘admin.php?page=simple-press/admin/panel-users/spa-users.php&form=member-info&%_%’,