I use SeaDAS GUI on my Mac for raster calculations and visualization.
I am trying do the same on a Linux computer. When I launch 'seadas' I get the following message window:
"An Internal Error occurred. Not able to create user interface control for page component World Map Location"
I do get a SeaDAS window. But I do not see any mask options.
"An Internal Error occurred. Not able to create user interface control for page component World Map Location" is often due to using a Linux distro supplied Java (e.g., openjdk) instead of the Oracle version. If you are using Oracle Java the problem could be with your graphics configuration. Linux has many options the X-windows graphics seadas uses -- defaults for newer distros may not be compatible with seadas 7.
Many Linux distros can't provide Oracle Java due to a recent change by Oracle in their license. Seadas 7 works well using the Oracle Java runtime environment (JRE) provided by ESA SNAP, or (if you can agree to Oracle's license) you can download the Java 1.8 JRE from Oracle.