Empty trash. Now create a file "TEST". Attach an emblem. Move the file to the trash. Open the trash in nautilus... The nautilus window will not be responsive but the process will hog the CPU. Trying to close the nautilus window will not work, instead you will get a window asking if you want to end the non-responsive process. Using "gvfs-ls trash:///" works fine. I can use the trash applet to empty the trash, which works, but the trash applet still shows the trash as full... so same symptom as Bug 579228. I just investigated this on F13 beta+updates but I think F12 may have the same problem.
Working on it, upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=614544
gvfs-1.6.1-3.fc13 has been submitted as an update for Fedora 13. http://admin.fedoraproject.org/updates/gvfs-1.6.1-3.fc13
gvfs-1.6.1-3.fc13 has been pushed to the Fedora 13 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update gvfs'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/gvfs-1.6.1-3.fc13
gvfs-1.6.1-3.fc13 has been pushed to the Fedora 13 stable repository. If problems still persist, please make note of it in this bug report.