I got the following email from Amazon a couple of days ago (because I own an amazon DX cover). I guess they are finally realizing there is a problem.
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Dear Kindle User,
We’re sending this note to remind you about proper attachment and use of your Kindle cover and about Amazon’s Kindle warranty. You can view instructions and illustrations here:
Amazon.com Help
ATTACHING THE COVER
To install the Kindle, open the cover and lay it on a flat surface. Then insert the bottom attachment hook on the cover into the bottom slot on the left edge of the Kindle. Rotate the Kindle to insert the top attachment hook. Then slide the switch down slightly to lock the cover attachment hooks in place.
Be sure to place the Kindle flat on the cover during installation. Do not tip the Kindle at an angle during installation, as that may cause the cover attachment hooks to bend.
USING THE KINDLE COVER
When using your Kindle with the cover, be careful to open the front cover only. If you open the back cover and pull the cover away from the Kindle, that may cause the attachment hooks to bend and could result in cracking or other damage to the Kindle.
THE AMAZON KINDLE WARRANTY
Your Kindle is covered by a One-Year Limited Warranty you can view here: Amazon.com Help: Kindle (U.S. Wireless) One-Year Limited Warranty
If the attachment hooks on your cover have become bent, or your Kindle has developed cracking or other damage near the location where the hooks connect to the Kindle, please contact Kindle Support by phone or email regarding warranty replacement.
You can reach us via phone or e-mail through our website by clicking the Contact Us button on our help pages at Amazon.com Help: Kindle or directly by calling one of these numbers:
Inside the United States: 1-866-321-8851, Outside the United States: 1-206-266-0927.
For more information, please see the Warranty Service section of the Kindle Return Policies Help page:
Amazon.com Help: Amazon Kindle Returns Policy
Sincerely,
The Kindle Team