Comment 7 for bug 787799

Open gconf-editor and change the following keys:

/apps/metacity/keybinding_commands/command_screenshot => gnome-screenshot /apps/metacity/keybinding_commands/command_window_screenshot => gnome-screenshot -w

Sorry for any inconveniences.

There are updated packages for F14 and F15:
https://admin.fedoraproject.org/updates/shutter?_csrf_token=9ba50b760248e8a70170df9ad2ba4b9d6858fe6c

Did you try those as well? I will download the latest version of Fedora to see if things are broken.