A beta of the forthcoming Swing Designer v7.0 is now available for Windows, Linux & OSX.
This release includes full support for MiGLayout as well as UI Factories.
This should be installed into a clean copy of Eclipse 3.4 that does not have any earlier version of Swing Designer (e.g., v6.9.0) installed.
Updated preliminary docs are available here.
All bug reports should be sent to wb-support@instantiations.com.