have you also scanned your computer for a virus? my mac friend doesn't get alot, but maybe its being a problem.
also, you haven't installed any new programs? sometimes they change settings, just completely randomly.
and if you have a firewall, mine has a list of which sites to allow, and it generally blocks alot of others i wouldn't have considered a problem *overprotective thing i have to turn it off all the time

* so maybe you want to check those settings as well.
other than that i'm sorry i can't help you more, i only know 1 person who uses a mac. and hes not online right now
edit: i asked him and he hasn't a clue sorry

its loading fine for him.