The new stable version with lots of new features is available http://archive.xfce.org/src/xfce/thunar/1.6/Thunar-1.6.0.tar.bz2 Please make an update for F18.
Pushed in rawhide. There is debate on the fedora xfce list as to if this should go out as a f18 update now, or wait... Please do chime in there.
exo-0.10.0-1.fc18,Thunar-1.6.0-1.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/exo-0.10.0-1.fc18,Thunar-1.6.0-1.fc18
Package exo-0.10.0-1.fc18, Thunar-1.6.0-1.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 exo-0.10.0-1.fc18 Thunar-1.6.0-1.fc18' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2012-19780/exo-0.10.0-1.fc18,Thunar-1.6.0-1.fc18 then log in and leave karma (feedback).
exo-0.10.0-1.fc18, Thunar-1.6.0-1.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.