Jennifer,
I have just telephoned AHPC and they know of no problems with their web site. I have had no problems accessing it either. I have however had the odd problem in my internet cafe lately accessing sites outside of Australia. The problem may be reciprocal.
I asked them about your emails and they have received them (it?) and Andrew either has just or is about to send you a reply.
I have found there can be delays with emails from AHPC as they are occasionally slower to answer than you might expect.
Rob.