Trouble loading shutterfly website & uploading from Iphoto

All of a sudden my iMac can't load the website www.shutterfly.com. It tries to load but eventually just times out. This has been going on for over 2 weeks. As a result, I can't evenget to the shutterfly landing page to log into my account and I can't upload new pics from Iphoto to Shutterfly using the export assistant (I get an error message). I'm running OS X 10.6. I've cleared cache & made sure I'm running the most current versions of Flash & Java, and still no joy. I have no problem getting onto shutterfly.com from my PC netbook or from my iPad. What gives?