I'm using both a 3 year old iMac and a Windows 7 laptop. 80% of the time I am getting an "Invalid URL" error message. Problem exists with IE, Safari, and Chrome. All other sites (yahoo, netflix, amazon, etc) load up perfectly. I can also go directly to gmail.com and access my mail. Problem also with iPad2,iPad mini, and wife's 2 year old iMac. After being unable to get on I will come back a few hours later and be successful.