In the most recent version of ImageMagick:
Version: ImageMagick 6.3.3 03/13/07 Q8 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC
I'm seeing the same bug in the fill drawing primitive that I reported for IM 6.3.1 here: viewtopic.php?f=3&t=8185&p=25113&hilit=#p25113
Same test, same result as in my previous report.