After updating to Mavericks my installation of window tidy stopped working. This really distrubed my harmony. The following was the solution I came accross.
- Open “System Preferences”
- Select “Security & Privacy”
- Select the “Privacy” tab
- Select “Accessibility” from the list on the left
- Click the padlock to enable changes
- Enter your admin password when prompted
- Tick “Window Tidy” in the list on the right