In the fullscreen mode of Shotwell 0.22.0, the toolbar was pinned open, and would not respond to any clicking. I am using Fedora 22. I'm not sure whether this affects many people or if it is just something weird that happened to me, but here is the workaround:
1. Install dconf-editor.
2. Open dconf-editor.
3. Click 'org' on the left, then click 'yorba, then 'shotwell', then 'preferences', then 'ui'.
4. Click the checkbox 'pin-toolbar-state'.
Strangely, after using this workaround the toolbar began responding to clicking and working normally.