More great info, especially the Panther feedback. I will update the summary shortly.
I outlined the problem and e-mailed Amazon.com. Here's the response I just received. Unless I'm missing something I think it's of no help to us. After I post this I'm rewriting them.
****************
Thanks for writing us at Amazon.com.
I am sorry you encountered problems while using our web site. Here
are some suggestions that usually help:
1) Try reloading. If the site is taking a long time, or if a page
loads for a long, long time, click the "Stop" button at the top of
your browser and then click "Reload" or "Refresh" at the top of your
browser window.
2) Clear your cache. Most browsers temporarily store a local copy of
every page you visit on the web. Clearing your cache deletes all of
those files and makes room for new ones. Go to the "Cache"
or "Temporary Internet Files" option on your Web browser (on
Netscape, go to "Options" and choose "Network Preferences"; if you
use Internet Explorer, go to "Tools" and choose "Internet Options"),
and delete the files stored in your cache.
3) Clear your cookies. The problem may be caused by one of our
servers, or by corrupted cookie files on your browser. In either
case, clearing your cookies should solve the problem. For Internet
Explorer, go to Tools > Internet Options > Delete Cookies. For
Netscape or Mozilla, go to Edit > Preferences > Privacy & Security >
Cookies > Cookie Manager > Remove all Cookies. After doing this,
simply sign in to our web site again, and your items should still be
in your Shopping Cart.
4) Try our standard server. If you have trouble accessing the order
form, or if the order form gives you an error on the final step,
using the standard server should allow the order to go through. You
can select the standard server when you enter your e-mail address and
password after clicking "Proceed to Checkout." When submitting an
order on the standard server, if we don't already have your credit
card number on file, it's best to enter just the last five digits of
the card number and then call us with the complete number after
placing the order.
If none of these suggestions solves the problem, please click the
link below to send us a detailed description of the error and where
it is occurring. Any information you can provide us may help us solve
the problem and lessen your frustration in the future. Thanks for
shopping with Amazon.com.
*********
Will try to get them to dig deeper than this.