there is a workaround to fix that problem temporary:

add before line 9

<?php 
    $subject = $details['field']['subject'];
    $body = $details['field']['body'];
?>

change line 12

        <?php echo CHtml::textField("email_{$tab}_subj_{$grouplang}",$esrow->$subject,array('class' => 'form-control', 'size'=>80)); ?>

change line 22

        <?php echo CHtml::textArea("email_{$tab}_{$grouplang}",$esrow->$body,array('cols'=>80,'rows'=>20, 'class'=>'form-control')); ?>

Does this still happen in the latest Build?

Closed due to missing feedback.