Be sure you have the latest version of Aquaria, 1.1.0.
Go to the Aquaria 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 1.1.0, go download the latest version.
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 contact Ambrosia Tech Support.