Sling found another bug... orz.

http://wakaba.c3.cx/releases/wakaba_2.0.3.zip

The only files that have changed since 2.0.2 are futaba_style.pl and oekaki_style.pl (and config_defaults.pl if you want to get the new version number).

If you have a hand-customized futaba_style.pl, the fix is this: Change

get_reply_link($num),$parent

to

get_reply_link($num,$parent)