I have just 'upgraded' to the latest version and it would appear that Amazon has already been dropped as a source, although the option still remains on the search. It would also appear that Discogs does not work either as I have recieved a negative return from them also.
I have, in the past, used mainly Amazon for disc information as it was quick and easy. With discogs I have had to go through the hassle of opening an account with them and the giving Orange permission to use my account. However, this seems to be "broken" as I have not been able to get anything from thei source.