Found my problem and fixed. Not sure if it will help anyone else, but here's what happened:
Yesterday I was happily typing along in another program when my firewall generated a popup from the systray. Because it automatically went "on top" (I'm sure everyone is familiar with this maddening circumstance) and I was typing furiously in another program, I made a change to the firewall without knowing what it was. A quick check in the firewall settings didn't seem to reveal any problem so I let it go.
Just now I tried to email myself a book from calibre, and when that failed I reasoned that the firewall must have blocked calibre's internet access. Sure enough, a slower, more careful survey of the firewall settings revealed that this was the case. Gave calibre full access again and all is fine.
Thanks so much for this great program!
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