When attempting to see my kindle books on either my Kindle reader or Cloud reader on a PC, all I get is a black screen. Downloading from the "content and devices" page does not work every time. Have reported repeated problems and been told that a ticket was given to the "developers" but was never contacted by them. Last thing done was that I was advised to buy a new Kindle reader (which I did) and within 24 hours was having the same issue again. ANY help would be appreciated!!