If the font Times New Roman is not active on a MacOS system, GamutWorks will not show the main window when launched. Activating the font and relaunching GamutWorks will resolve the issue.

This is not an issue for most users, since "Times New Roman" is installed with MacOS by default. Users with a font manager application like Suitcase or FontAgent may disable some of the standard system fonts. These same applications should be able to enable the needed font when the user wants to run GamutWorks.