in the file /administrator/templates/isis/html/com_edocman/category/default.php
user_ids field the value is not visible, if saved a second time the value is lost lik eif it was empty
Code:
<input type="text" name="jform[user_ids]" id="jform_user_ids" value="79,173,244,82,292,81,119,161,83,1428,231" class="inputbox" aria-invalid="false">