Calibre has to be open on your computer. The Calibre server is on an icon in the toolbar at the top labelled "connect/share" and it has to be "green" for "on". Any app that sends information from your PC to a device requires a server so the data can transfer from one to the other... I have set my server, in preferences---sharing over the net, to "start automatically when calibre starts" by checking off the box in front. The server doesn't run if Calibre isn't running so I usually always open Calibre when my computer is on so that I can load stuff anytime I choose to...
Last edited by Cdesja5; 06-19-2012 at 05:20 PM.