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"
Posted Date : 2009-04-16 16:37:14.0

This issue is reproducible on both SLES 11 x64 and SLES 11 x86.
JDK bundle is JDK1.4.2_21 b01 32bit.
Posted Date : 2009-05-08 15:35:38.0

N/A

Click to to toFront button finally cause call of pShowModal() in awt_TopLevel.c and that do  XtPopup(wdata->winData.shell, XtGrabNone); 
parameters of XtPopup is exactly the same for RHEL5 (where everything works fine) and SLES11 so the root cause of problem is metacity WM or X11 it self, not java.
Posted Date : 2009-04-29 06:27:58.0

It's Gnome/Metacity issue
http://bugzilla.gnome.org/show_bug.cgi?id=567528#c13

Patch will be provided in SLES11.
Posted Date : 2009-07-18 21:29:25.0

Novell has released the patches.

*****************************************************************************
metacity-2.24.0-3.18.1.i586.rpm		714.9 KB (732062) 2009-09-03 06:14:18
metacity-lang-2.24.0-3.18.1.i586.rpm	778.3 KB (797015) 2009-09-03 06:14:20

Architecture: x86
Security patch: No
Priority: Recommended
Distribution Type: Public

Download: http://download.novell.com/Download?buildid=DOQuPh4BnCQ~

Package: metacity metacity-debuginfo metacity-debugsource metacity-devel metacity-lang
Product(s): SLES 11 DEBUGINFO, SLE 11, SLED 11, SLES 11
Patch: slessp0-metacity-1121
Release: 20090717

*****************************************************************************
metacity-2.24.0-3.18.1.x86_64.rpm	708.9 KB (725953) 2009-09-03 06:15:34
metacity-lang-2.24.0-3.18.1.x86_64.rpm	778.3 KB (797020) 2009-09-03 06:15:36

Architecture: x86-64
Security patch: No
Priority: Recommended
Distribution Type: Public

Download: http://download.novell.com/Download?buildid=5LuVUBm_v4Q~

Package: metacity metacity-debuginfo metacity-debugsource metacity-devel metacity-lang
Product(s): SLES 11 DEBUGINFO, SLE 11, SLED 11, SLES 11
Patch: slessp0-metacity-1121
Release: 20090717
Posted Date : 2009-09-12 13:19:06.0

Checked with released patches - test passed ok ( executive.russia ).
Posted Date : 2009-09-18 16:29:01.0