The computer already has a fixed ip, as it's also used for a Plex server.! I used port forwarding, using a different, unassigned port, for Calibre. It is still picking up the loopback address for Calibre (only, Plex has and still does work fine). Calibre is assigned a different port on the same ip as Plex. Thus only happened after I installed the latest update. Prior to that, the content server reported the correct internal address and port. Guess I'll have to uninstal this version, as it's clearly the issue.
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