Be sure you have the latest version of pop-pop, 1.0.6.
Go to the pop-pop folder and select the application icon by clicking on it one time, then go to the File menu to Get Info. If it is any version prior to 1.0.6, download the latest version.
Before launching the update, throw out the preferences for pop-pop. Go to your Home/Library/Preferences folder and drag the pop-pop prefs file to the trash. Then launch the game.
If problems persist or you are already running the latest version, read through the rest of the FAQs for currently known issues and workarounds.
For further assistance send a question to our Support Team.