newer versions of calibre need python-cssutils 0.9.9. An update in f17 and rawhide at least would be welcome. Let me know if you would prefer I just do the update, happy to help.
Feel free to perform the update, especially if you're able to test it with calibre at the same time!
calibre-0.8.50-1.fc17,python-cssutils-0.9.9-1.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/calibre-0.8.50-1.fc17,python-cssutils-0.9.9-1.fc17
Package calibre-0.8.50-1.fc17, python-cssutils-0.9.9-1.fc17: * should fix your issue, * was pushed to the Fedora 17 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing calibre-0.8.50-1.fc17 python-cssutils-0.9.9-1.fc17' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-7363/calibre-0.8.50-1.fc17,python-cssutils-0.9.9-1.fc17 then log in and leave karma (feedback).
calibre-0.8.50-1.fc17, python-cssutils-0.9.9-1.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.