Images look unsharp when converted to Kindle format

Hello.
I have a book in InDesign that I want to be exported in both PDF and to Kindle (.mobi). The PDF version is totally fine, but the images in the Kindle version are awful. They have become blurry and unsharp, and are not readable! This is a weird happening, because I have earlier converted books to the Kindle format where the images looked fine.
What can I do to have the images in the same quality as in the PDF file. The images in all books (including this one) are in web resulotion (72) - but shouldn't this be enough?
My specs:
Windows 7 Professional
Intel @ 3.10 GHz
8 GB Ram
Adobe InDesign CS 5
Kindle export tool (newest update)

According this reference, the resolution (ppi) for the Kindle varies with model from about 60 to 100 ppi:
http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density#Amazon
I'd set a higher resolution.

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Message was edited by: devongovett
Message was edited by: devongovett

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