When SwingSet3 demo is using JDK7 (build 1.7.0-ea-b107) none of the demos can be loaded.
When selecting any of the demos from the demo pane the selected demo is not loaded into the demo area. The log shows IllegalArguementException thrown. (attached)
SwingSet3 webstart application can be obtained from http://download.java.net/javadesktop/swingset3/SwingSet3.jnlp
To reproduce launch the jnlp using JDK7 and select any demo.
UPDATE: There are at least 3 demos with severely messed up layouts. If SwingSet3 is launched using JDK7 b136, the demos: Spinner, Slider and ToggleButton show poor layout rendering. (see attached screenshot that show difference betweeen 1.6.0_24 and 1.7.0 b136)