F17 currently has 7.3.638, but F18 has older 7.3.622. Looks like you've forgotten to submit vim-7.3.638-2.fc18 as a Bodhi update.
vim-7.3.682-1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/vim-7.3.682-1.fc18
Package vim-7.3.682-1.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 vim-7.3.682-1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-15457/vim-7.3.682-1.fc18 then log in and leave karma (feedback).
vim-7.3.682-1.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.