I would also like to mention that many of the plugins while not blatantly failing, do not show on the toolbars and when I attempt to customize them, I get a popup that calibre needs to restart before I can customize the plugin. EpubMerge, FanFicFare, KoboUtilities, ModifyEpub and QualityCheck are some of the culprits. Seeing as I did a clean install of CalibrePortable and restarted after each plugin install, I'm rather doubtful that another restart of calibre will help.