Pandor wrote:
I wonder if this is a problem with our internet provider, or possibly our home router...
After I got off line it occurred to me that "Unknown Host" is probably a DNS error. In which case changing browsers won't help. So then the question is are you getting to a DNS server at all or is the DNS not updating itself? I don't know how tech savy you are and I can only help you with Windows. Do you know how to check your TCP/IP settings?