Why does Amazon no longer work in Safari?

Question

For about a month I've been unable to use the Amazon website in Safari.  Anything I click on gets an error message like;  "An error occurred trying to process your request.  Be assured we are working on this."  And Amazon can't recognize my password, and Safari says it can't recognize the website because the "certificate" is wrong.
All this works perfectly from a tablet.
I have emptied the Safari cache and deleted all cookies, with no result.

Answer 1

In order to make an informed choice, you should be familiar with the privacy implications of using OpenDNS. If you use the free service, you are not an OpenDNS customer, and the company  — a for-profit corporation — doesn't have a contract with you and doesn't owe you anything. The marketers to whom OpenDNS sells information about your Internet usage are its customers. OpenDNS will know, and store, the address of every Internet server you use from now on. This is from its privacy policy:
When you use OpenDNS services, OpenDNS stores certain DNS, IP address and related information about you to improve the quality of our service, to provide you with OpenDNS services and for internal business and analysis purposes.
Concerning personal information, the policy states:
...[I]t is disclosed to entities that perform marketing services on our behalf or to other entities with whom we have joint marketing agreements...
You can't opt out of those disclosures.
The advantages of OpenDNS that are often touted on this site are mostly, if not entirely, mythical. It is almost certainly not any faster than your ISP's DNS servers. More likely, it's a little slower, though the difference is not going to be noticed either way.
ISP's do not intentionally redirect valid DNS queries, though it sometimes happens because of a misconfiguration. Your ISP may, and OpenDNS certainly will, redirect invalid queries to ad sites, in violation of published standards for DNS.
The claims on the OpenDNS website that it "blocks" malware attacks such as Flashback are false. A name service does not and cannot block anything. All it can do is to selectively block queries. It's trivial for a malware attacker to evade such blocks. It's just as easy to evade the parental controls offered by OpenDNS.
The one thing to be said for OpenDNS is that it doesn't seem to cause problems with the DNS prefetching performed by all modern web browsers, including Safari. The same can be said of Google DNS (which I'm not recommending either) and other, non-promoted, public name services such as Level3.
Linked below is a brief. somewhat outdated, critique of OpenDNS on a Harvard Law School blog, with a response from the company's founder:
OpenDNS and Firefox Search