http://bugs.winehq.org/show_bug.cgi?id=26930
--- Comment #7 from Alexander Nicolaysen Sørnes alexsornes@gmail.com 2011-10-09 07:49:49 CDT --- I haven't removed the default text, but now it should be possible to add replies even after editing the text.
It turns out it's better to alter the 'value' member of the reply field, instead of its innerHTML.