When running GooCalSync under Mac OSX an additional step is required to allow the Application to run correctly.
This step is NOT required if running on Windows.
Mac OSX version 10.6.8
Open Finder
Select Applications
Hold down control key and click on Lotus Notes, this will then give you a menu, select View Package contents
Open the MAC OS folder
Replace the file called Java.Policy with the file provided at this link
Exit Lotus Notes
Open Lotus Notes, GooCalSync will now run as expected