Hi Tony,
(I did send you a private reply, but for the record...) It was my
understanding that the Google Marketplace handles refunds; but it has
also been my experience that once I buy an app, I can re-download and
install it on the same device many times without having to pay again.
We'll be in contact with Google, and keep you informed.
As for the problem with Samsung, I have not come up with an
explanation, yet.
Sorry for the trouble,
Mike