Jailbreak and Amazon will not walk on the same path. Not together, at least. Although Amazon's new Instant Video app for iPad offers a boat-load of new TV and movies to iPad users running the latest version of iOS, the new app won't work if your iPad has been jailbroken.
The report was first uncovered by The Verge when one of its readers downloaded the new Instant Video app to his iPad, which was running a Cydia-enabled jailbroken version of iOS 5.1.1. But the Instant video app refused to work. The reader contacted Amazon customer support, who confirmed that the application generates an error on jailbroken iPads, and that the error message sent to Amazon indicated that the reader's device had been jailbroken.
“I'm sorry that the Amazon Instant Video service isn't yet working on your iPad,” stated the customer care reply. “The service is absolutely available to you. What we're finding is that this specific error is popping up for folks whose iPads have any kind of jailbreak installed. A jailbreak is a program installed on your device that lets you do stuff not necessarily supported by the manufacturer. For example, if Apple blocks access to fictional service provider Orange you can add a thing that gets around that block.”
“The presence of any of these indicates a jailbreak, and our service won't work. From the error message that you provided, it appears your device has been jail-broken. We are unable to provide any troubleshooting for your device,” it further added.
However, it's not directly clear as to what, in the jailbreaking process, interferes with the Instant Video app, although the presence of either the APT encryption key manager or the Cydia app store appears to be a serious factor. Stay tuned for more on this, and possibly a fix if you are having the same problem.