Mac OS X 10.9 and 10.8 : When trying to run the app, an error message appears: "Pomato.app" is damaged and can't be opened.
This is caused by the default security settings of Mac OS X. These allow only applications downloaded from "Mac App Store and identified developers" to be run. To change this, please go to -> Apple menu -> System Preferences... -> Personal -> Security & Privacy -> General pane -> Allow applications downloaded from -> [x] Anywhere.
Possible alternative: Instead of changing the system-wide setting, try control-clicking the application icon and changing the security settings there.