javaws will consistently crash when launched by an unprivileged user on AMD 64-bit Windows Server 2003 SP1.  The folowing command using the webpad.jnlp file from a local copy of the jdk sample directory will generate an access violation:

  $ javaws webpad.jnlp

The crash appears to occur extremely early during startup.  The crash is reproducible regardless of which .jnlp file is used (even a non-existent one).  It does not occur if the the user is a local administrator on the machine.  The crash also does not occur in jdk1.5.0_09/64-bit Windows 2003 or jdk1.6.0-b105/32-bit Windows XP regardless of privilege.

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7d8e6201, pid=3380,
tid=5044
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-b105 mixed mode, sharing)
# Problematic frame:
# C  [Secur32.dll+0x16201]
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
#

---------------  T H R E A D  ---------------

Current thread (0x03dfa800):  JavaThread "Java Web Start Main Thread"
[_thread_in_native, id=5044]

siginfo: ExceptionCode=0xc0000005, reading address 0x00000000

Registers:
EAX=0x00000000, EBX=0x0455f164, ECX=0x00000016, EDX=0x00000000
ESP=0x0455eef8, EBP=0x0455f158, ESI=0x00000000, EDI=0x0455f0f8
EIP=0x7d8e6201, EFLAGS=0x00010246

Top of Stack: (sp=0x0455eef8)
0x0455eef8:   77f657f7 00000000 00500028 00000002
0x0455ef08:   00000d34 00000000 000013b4 00000000
0x0455ef18:   0000e898 00000000 00000000 00000000
0x0455ef28:   00000021 c0000022 00000001 00000000
0x0455ef38:   00000000 00000000 000ece0c 00000000
0x0455ef48:   00000000 00000000 00000000 00000000
0x0455ef58:   00000000 00000000 00000000 00000000
0x0455ef68:   00000000 00000000 00000000 00000000

Instructions: (pc=0x7d8e6201)
0x7d8e61f1:   00 00 8b 85 f0 fd ff ff 6a 16 8b f0 59 8d 7d a0
0x7d8e6201:   f3 a5 8b 4d a4 89 48 04 8b 4d a8 89 48 08 66 8b


Stack: [0x04510000,0x04560000),  sp=0x0455eef8,  free space=315k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native
code)
C  [Secur32.dll+0x16201]
C  [Secur32.dll+0x19de4]
C  [deploy.dll+0x29e3]
j  com.sun.deploy.security.MSCredentialManager.getLoginUID()J+0
j  com.sun.deploy.security.MSCredentialManager.<clinit>()V+65
v  ~StubRoutines::call_stub
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j  com.sun.deploy.security.MSCredentialManager.getLoginUID()J+0
j  com.sun.deploy.security.MSCredentialManager.<clinit>()V+65
v  ~StubRoutines::call_stub
j
com.sun.deploy.services.WPlatformService.getCredentialManager()Lcom/sun/deploy/security/CredentialManager;+0
j  com.sun.deploy.security.DeployAuthenticator.<init>()V+40
j  com.sun.javaws.JAuthenticator.<init>()V+1
j
com.sun.javaws.JAuthenticator.getInstance(Ljava/awt/Component;)Lcom/sun/javaws/JAuthenticator;+10
j  com.sun.javaws.Main.initializeExecutionEnvironment()V+200
j  com.sun.javaws.Main.continueInSecureThread([Ljava/lang/String;)V+160
j  com.sun.javaws.Main$1.run()V+16
j  java.lang.Thread.run()V+11
v  ~StubRoutines::call_stub

---------------  P R O C E S S  ---------------

Java Threads: ( => current thread )
  0x03e42800 JavaThread "CacheCleanUpThread" daemon [_thread_blocked,
id=1688]
  0x03e41000 JavaThread "Image Fetcher 1" daemon [_thread_in_vm, id=3904]
  0x03e45c00 JavaThread "Image Fetcher 0" daemon [_thread_in_vm, id=4532]
  0x03e07c00 JavaThread "traceMsgQueueThread" daemon [_thread_blocked,
id=3788]
  0x00397c00 JavaThread "DestroyJavaVM" [_thread_blocked, id=4576]
=>0x03dfa800 JavaThread "Java Web Start Main Thread" [_thread_in_native,
id=5044]
  0x03dc5400 JavaThread "AWT-Windows" daemon [_thread_in_native, id=4540]
  0x03dc4400 JavaThread "AWT-Shutdown" [_thread_blocked, id=460]
  0x03dc3800 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=2980]
  0x03dae800 JavaThread "Low Memory Detector" daemon [_thread_blocked,
id=4304]
  0x03da9800 JavaThread "CompilerThread0" daemon [_thread_blocked, id=4984]
  0x03da8800 JavaThread "Attach Listener" daemon [_thread_blocked, id=4928]
  0x03da7800 JavaThread "Signal Dispatcher" daemon [_thread_blocked,
id=4748]
  0x03da3000 JavaThread "Finalizer" daemon [_thread_blocked, id=3724]
  0x03d9ec00 JavaThread "Reference Handler" daemon [_thread_blocked,
id=3424]

Other Threads:
  0x03d95800 VMThread [id=4968]
  0x03db0000 WatcherThread [id=3312]
VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
 def new generation   total 960K, used 468K [0x23cd0000, 0x23dd0000,
0x241b0000)
  eden space 896K,  45% used [0x23cd0000, 0x23d35080, 0x23db0000)
  from space 64K, 100% used [0x23dc0000, 0x23dd0000, 0x23dd0000)
  to   space 64K,   0% used [0x23db0000, 0x23db0000, 0x23dc0000)
 tenured generation   total 4096K, used 402K [0x241b0000, 0x245b0000,
0x27cd0000)
   the space 4096K,   9% used [0x241b0000, 0x242148e0, 0x24214a00,
0x245b0000)
 compacting perm gen  total 12288K, used 789K [0x27cd0000, 0x288d0000,
0x2bcd0000)
   the space 12288K,   6% used [0x27cd0000, 0x27d955a0, 0x27d95600,
0x288d0000)
    ro space 8192K,  62% used [0x2bcd0000, 0x2c1cb9c8, 0x2c1cba00,
0x2c4d0000)
    rw space 12288K,  52% used [0x2c4d0000, 0x2cb0e348, 0x2cb0e400,
0x2d0d0000)

Dynamic libraries:
0x00400000 - 0x00423000  C:\Program Files (x86)\Java\jre1.6.0\bin\javaw.exe
0x7d600000 - 0x7d6f0000  C:\WINDOWS\system32\ntdll.dll
0x7d4c0000 - 0x7d5f0000  C:\WINDOWS\syswow64\kernel32.dll
0x77f50000 - 0x77fec000  C:\WINDOWS\syswow64\ADVAPI32.dll
0x7da20000 - 0x7db00000  C:\WINDOWS\syswow64\RPCRT4.dll
0x7d930000 - 0x7da00000  C:\WINDOWS\syswow64\USER32.dll
0x7d800000 - 0x7d890000  C:\WINDOWS\syswow64\GDI32.dll
0x7dee0000 - 0x7df40000  C:\WINDOWS\system32\IMM32.DLL
0x7dbc0000 - 0x7dbc9000  C:\WINDOWS\system32\LPK.DLL
0x75490000 - 0x754f1000  C:\WINDOWS\system32\USP10.dll
0x77ba0000 - 0x77bfa000  C:\WINDOWS\syswow64\msvcrt.dll
0x7c340000 - 0x7c396000  C:\Program Files
(x86)\Java\jre1.6.0\bin\msvcr71.dll
0x6d7c0000 - 0x6da07000  C:\Program Files
(x86)\Java\jre1.6.0\bin\client\jvm.dll
0x76aa0000 - 0x76acd000  C:\WINDOWS\system32\WINMM.dll
0x71bc0000 - 0x71bc8000  C:\WINDOWS\system32\rdpsnd.dll
0x771f0000 - 0x77201000  C:\WINDOWS\system32\WINSTA.dll
0x71c40000 - 0x71c98000  C:\WINDOWS\syswow64\NETAPI32.dll
0x76b70000 - 0x76b7b000  C:\WINDOWS\system32\PSAPI.DLL
0x6d310000 - 0x6d318000  C:\Program Files (x86)\Java\jre1.6.0\bin\hpi.dll
0x6d770000 - 0x6d77c000  C:\Program Files (x86)\Java\jre1.6.0\bin\verify.dll
0x6d3b0000 - 0x6d3cf000  C:\Program Files (x86)\Java\jre1.6.0\bin\java.dll
0x6d7b0000 - 0x6d7bf000  C:\Program Files (x86)\Java\jre1.6.0\bin\zip.dll
0x6d000000 - 0x6d1c3000  C:\Program Files (x86)\Java\jre1.6.0\bin\awt.dll
0x73070000 - 0x73097000  C:\WINDOWS\system32\WINSPOOL.DRV
0x77670000 - 0x777a4000  C:\WINDOWS\syswow64\ole32.dll
0x73860000 - 0x738ac000  C:\WINDOWS\system32\ddraw.dll
0x73b30000 - 0x73b36000  C:\WINDOWS\system32\DCIMAN32.dll
0x4b8d0000 - 0x4b921000  C:\WINDOWS\SysWOW64\MSCTF.dll
0x75e60000 - 0x75e87000  C:\WINDOWS\system32\apphelp.dll
0x4dc30000 - 0x4dc5e000  C:\WINDOWS\system32\msctfime.ime
0x6d250000 - 0x6d261000  C:\Program Files (x86)\Java\jre1.6.0\bin\deploy.dll
0x761b0000 - 0x76243000  C:\WINDOWS\syswow64\CRYPT32.dll
0x76190000 - 0x761a2000  C:\WINDOWS\syswow64\MSASN1.dll
0x7c8d0000 - 0x7d0d4000  C:\WINDOWS\syswow64\SHELL32.dll
0x045a0000 - 0x045f2000  C:\WINDOWS\syswow64\SHLWAPI.dll
0x04600000 - 0x0468c000  C:\WINDOWS\syswow64\OLEAUT32.dll
0x71720000 - 0x717ef000  C:\WINDOWS\syswow64\WININET.dll
0x04690000 - 0x04699000  C:\WINDOWS\syswow64\Normaliz.dll
0x6e850000 - 0x6e895000  C:\WINDOWS\syswow64\iertutil.dll
0x726d0000 - 0x727f4000  C:\WINDOWS\syswow64\urlmon.dll
0x7dbd0000 - 0x7dcd3000 C:\WINDOWS\WinSxS\WOW64_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.3790.2778_x-ww_3020900A\comctl32.dll
0x6d2b0000 - 0x6d303000  C:\Program Files
(x86)\Java\jre1.6.0\bin\fontmanager.dll
0x7d8d0000 - 0x7d920000  C:\WINDOWS\system32\Secur32.dll
0x71c00000 - 0x71c17000  C:\WINDOWS\system32\ws2_32.dll
0x71bf0000 - 0x71bf8000  C:\WINDOWS\system32\WS2HELP.dll
0x76e90000 - 0x76ecf000  C:\WINDOWS\system32\RASAPI32.dll
0x76e40000 - 0x76e52000  C:\WINDOWS\system32\rasman.dll
0x76e60000 - 0x76e8f000  C:\WINDOWS\system32\TAPI32.dll
0x76e30000 - 0x76e3c000  C:\WINDOWS\system32\rtutils.dll
0x76920000 - 0x769e4000  C:\WINDOWS\system32\USERENV.dll
0x722f0000 - 0x722f5000  C:\WINDOWS\system32\sensapi.dll
0x71e00000 - 0x71e14000  C:\WINDOWS\system32\msapsspc.dll
0x78080000 - 0x78091000  C:\WINDOWS\system32\MSVCRT40.dll
0x71e20000 - 0x71e70000  C:\WINDOWS\system32\msnsspc.dll
0x76c90000 - 0x76cb7000  C:\WINDOWS\SysWOW64\msv1_0.DLL
0x76cf0000 - 0x76d0a000  C:\WINDOWS\system32\iphlpapi.dll

VM Arguments:
jvm_args: -Xbootclasspath/a:C:\Program Files
(x86)\Java\jre1.6.0\lib\javaws.jar;C:\Program Files
(x86)\Java\jre1.6.0\lib\deploy.jar -Djava.security.policy=file:C:\Program
Files
(x86)\Java\jre1.6.0\lib\security\javaws.policy -DtrustProxy=true -Xverify:remote
 -Djnlpx.home=C:\Program Files
(x86)\Java\jre1.6.0\bin -Djnlpx.remove=true -Djnlp.publish-url=$$context/publish
 -Djnlpx.splashport=2205 -Djnlpx.jvm="C:\Program Files
(x86)\Java\jre1.6.0\bin\javaw.exe"
java_command: com.sun.javaws.Main C:\DOCUME~1\calvin\LOCALS~1\Temp\1\javaws5
Launcher Type: SUN_STANDARD

Environment Variables:
PATH=C:\Perl\bin\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\system32\WBEM;C:\texmf\miktex\bin;C:\Program
Files (x86)\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\Microsoft
Platform SDK for Windows Server 2003 R2\Bin\.;C:\Program Files\Microsoft
Platform SDK for Windows Server 2003 R2\Bin\WinNT\.;C:\Program
Files\Microsoft Compute Cluster Pack\Bin\;C:\Program Files (x86)\Microsoft
SQL Server\80\Tools\Binn\;C:\Program Files\Microsoft SQL
Server\90\DTS\Binn\;C:\Program Files\Microsoft SQL
Server\90\Tools\binn\;c:\cygwin\bin;;C:\WINDOWS\system32\WindowsPowerShell\v1.0;C:\WINDOWS\SUA\common\;C:\WINDOWS\SUA\usr\lib\;"C:\Program
Files (x86)\Java\jre1.6.0\bin"
USERNAME=calvin
LD_LIBRARY_PATH=/usr/lib/x86:/usr/X11R6/lib
DISPLAY=localhost:0.0
OS=Windows_NT
PROCESSOR_IDENTIFIER=AMD64 Family 15 Model 31 Stepping 0, AuthenticAMD



---------------  S Y S T E M  ---------------

OS: Windows Server 2003 family Build 3790 Service Pack 1

CPU:total 1 family 15, cmov, cx8, fxsr, mmx, sse, sse2, mmxext, 3dnowext,
3dnow

Memory: 4k page, physical 2096516k(1286648k free), swap 4059272k(3098296k
free)

vm_info: Java HotSpot(TM) Client VM (1.6.0-b105) for windows-x86, built on
Nov 29 2006 00:48:48 by "java_re" with unknown MS VC++:1310