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Hi,
One possible explanation is that the source of your books is a standalone Kindle ...
Kindle has recently updated its firmware to 2.5 and this change has changed the way PID's are used from one per device to a unique PID used for each and every book/user combination. Without this unique book/user specific PID, you can not run any of the tools.
So if your Kindle firmware updated recently (wirelessly?), then its single PID can no longer be used.
There are workarounds if you use Kindle4 For PC but for standalone Kindles - unless you are using version 1 which has no firmware update - any recent firmware update will prevent you from using a known PID in the way that you want.
PM me if you want more info.
KevinH
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