dwm 5.9 (mostly a bugfix release) was announced yesterday, Fedora should update to the new version. http://lists.suckless.org/dev/1107/8923.html
dwm-5.9-1.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/dwm-5.9-1.fc15
*** Bug 720280 has been marked as a duplicate of this bug. ***
Package dwm-5.9-1.fc15: * should fix your issue, * was pushed to the Fedora 15 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing dwm-5.9-1.fc15' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/dwm-5.9-1.fc15 then log in and leave karma (feedback).
dwm-5.9-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.