OS/Platform: failed on SLES 11 x64 ( rc6 - final ), passed on SLES 10 x64
JDK: failed on 1.4.2_21 b01, 1.4.2 fcs b28 ( looks like all 1.4.2 )
Testsuite: JCK 1.4a
Test: test api/java_awt/interactive/WindowTest.html#WindowTest

Desc:
  test checks move front/back window/frame functionality.
  See test source attached ( WindowTest.java )

  Failure: window isn't moved behind the frame ( Window.toFront(), Window.toBack() works incorrectly ).
  Test passed OK on SLES 10, but failed on SLES 11 for all 1.4.2 JDK.

How to reproduce: see comments

Detailed OS info:
    SUSE Linux Enterprise Server 11 (x86_64)
    VERSION = 11
    PATCHLEVEL = 0
LSB_VERSION="core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-x86_64:core-3.2-x86_64:core-4.0-x86_64"
This issue is reproducible on both SLES 11 x64 and SLES 11 x86.
JDK bundle is JDK1.4.2_21 b01 32bit.