As per title. When using the section edit buttons to edit the last section of a page, the last character in the section does not make it into the textarea edit box. That character isn't put back when saving either - it is dropped.
refer
http://wiki.jalakai.co.uk/dokuwiki/doku.php?id=dev:bugs#section_editing_drops_last_character
(though I have no extra information at present)