I've recently upgraded to Calibre 6.12, which is working very well.
However, when I plug my Sony PRS505 in, Calibre gives me the message "Sony Pocket Edition detected" in the lower left of the screen. At the top right of the screen (near the big red heart) are the words "Connected PRS505."
Does Calibre think I'm plugging in the Sony 300? I'm running XP SP3.