I'm not sure if this has been reported or not, so forgive me if this is the case already.
I seemed to have come across an issue with the Helpers\Form\Members class.
Example:
$form->add( new \IPS\Helpers\Form\Member( 'member_id', \IPS\Member::load( $member->member_id ), TRUE, [], NULL, NULL, NULL, 'member_id' ) );
Any form using this form element ill lose its value/s after you refresh the page the form is on.
All other elements display correctly after a page refresh.
Can anyone else confirm?