https://bugs.winehq.org/show_bug.cgi?id=39980
--- Comment #2 from Austin English austinenglish@gmail.com --- (In reply to Piotr Caban from comment #1)
I can't reproduce the issue. Are you sure that it's not related to e.g. the ebooks you have in My Documents\My Kindle Content?
I do have one DRM enabled book which may be related. I haven't had a chance to retest if that is the reason though.
Do you have any purchased/not free books?