Nine times out of then when I attach my Kindle Fire to download from my Calibre library, the Send to Device icon does not show up. The tenth time it will show up and I'm able to load some books from Calibre to Kindle. Lately, it takes unlimited tries before I either give up or the icon finally appears. I've tried all the suggestions in FAQ - using different ports, doing hard shut downs of both Kindle and computer, making sure I have the most current version. It worked just fine when I first used Kindle after Xmas last year
. Now I'm trying to load my library onto my son's Kindle Fire and the icon will just not come up! HELP!!!!