Amazon uses the server time in its API requests and so if the system time is off one will not be able to use Amazon content. Verify that your server time is correct, uptdate it if necessary, and make sure all of your Amazon preferences are turned on.
Amazon also requires an ISBN for displaying book covers – make sure that you have the correct ISBN for your title. If you are having trouble with a book that seems like it should have a cover but doesn’t turn one up, give it a try with the 10 digit ISBN in the first 020a. If you have a 10 digit and it’s not turning up, try with the 13 digit ISBN in the first 020a.
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