Note there is a new release of the Quicklook generator available today at https://github.com/jaketmp/ePub-quicklook
. Check the README (that page) and follow the Downloads link to get the new release.
If you find problems and have a github account, please raise an Issue on that web page. If you find problems and don't - post them here instead and I will raise them myself.
Jake and I are making good progress on the Spotlight importer, which is part of that project. Hopefully we can make a release of it soon.