JCK : JCK-runtime-6a b14
J2SE : FAIL - jdk6u10 build 10 Kernel JRE under IE 6 and 7.
Platform[s] : FAIL - windows XP Home and Pro
switch/Mode : FAIL - default

Test api/javax_swing/plaf/basic/BasicInternalFrameUI/index.html#protected fails under both old and new plugin for 6u10 b10 kernel JRE bundle.
suggested code

try {
            UIManager.setLookAndFeel(new javax.swing.plaf.metal.MetalLookAndFeel());
        } catch (UnsupportedLookAndFeelException e) {
            e.printStackTrace();
        }


fixes the problem.
The bug is reproducible only with "Windows XP" desktop theme.