Thanks for the pointer, Evgeny. Thus are the perils of trying to get a fix out too soon.
I will put this in to the 1.3 release that I'm working on, but until then you can change this line
<copy file="
dashboard.css" todir="${gen.report.dir}"/>
to
<copy file="${tool.basedir}/dashboard.css" todir="${gen.report.dir}"/>
thanks again,
John