Hi Donna,
from your description I'm afraid I'm not immediately familiar with this site and I thought I knew most of them, sounds a great site as you say.
When did you last use it ?
What website address do you have, please, so someone else can try the link ?

Lately my PC (running MS Vista) has started regularly posting "unavailable" messages when trying to access sites, yet on retrying usually works fine - I think its an old virus-related gremlin, perhaps this is the same for you, have you tried updating all your virus s/w and running scans etc, just a thought.
Jeff