I have pretty much the opposite problem. My news sources are selected to download every day at a certain time (6am). However, when I'm on the road, away from a wifi Internet connection, and have calibre open (to read pre-downloaded sources), the downloads still proceed. The result is a whole bunch of empty news with 0.1MB size.
It would be better to only have downloads proceed when a valid Internet connection can be established. Otherwise, one's library fills up with a lot of junk.
(OS X, running Calibre 0.7.18)
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