The gvrng package will install if you don't have pygtksourceview installed, but it won't run.
gvrng-4.4-4.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/gvrng-4.4-4.fc18
gvrng-4.4-4.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/gvrng-4.4-4.fc17
This is now fixed.
Package gvrng-4.4-4.fc18: * should fix your issue, * was pushed to the Fedora 18 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing gvrng-4.4-4.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2013-0953/gvrng-4.4-4.fc18 then log in and leave karma (feedback).
gvrng-4.4-4.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
gvrng-4.4-4.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.