I'm thinking bwaldron is correct here. The same issue happens to me and I know these books have covers, but the thumbnail views do not have covers.
[Update]
I just tried converting a MOBI to MOBI using calibre and it seems to work. All of my books with missing thumbs are now showing on the K4A
=X=
Last edited by =X=; 02-02-2011 at 09:42 PM.
Reason: Added update
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