Okay, 0.12.10-22 is uploaded now, for both Diablo and Fremantle. This adds support for calibre as a network library - you'll need to edit the /usr/share/FBReader/network/calibre.xml file to remove the comment lines (<!-- and -->) and change the server address. It also stops the popup window from appearing while expanding a collection in the tree browser. The source code changes can be downloaded from here. Let me know if there's any issues, otherwise I'll push it to extras-testing next week.