When implementing two globalproperties portlets on one JSP page, the input fields and save / cancel buttons get out of sync. This can probably be remedied by creating a unique id for each rendering of the portlet and prepending/appending it to the "gp_X" ids used for the global property inputs.
The file to edit is located at:
The PortletController class provides a unique id (might be a uuid even) for every rendered portlet. This variable is avialable in globalProperties.jsp