Try the latest 9-CURRENT shapshot from here:
http://ftp.freebsd.org/pub/FreeBSD/s...amd64-dvd1.iso
If that one will also hang, submit a BUG here:
http://freebsd.org/send-pr.html
... and post mail to the
freebsd-current [AT] lists.freebsd.org and
freebsd-stable [AT] lists.freebsd.org mailing lists with description of Your problem.