Applet-Test: 6u18-b03 applet fails to load with IE

Testsuite name: Applet Compatibility
JDK/JRE tested: 6u18b03
OS/architecture: x86 Vista-business(sp2), Windowns7 ultimate x64
Reproducible: Always
Reproducible on machine:
[If sometimes] Also reproducible on machine:
Is it a platform specific regression: N
[If yes] Is it a new platform support: Y/N
[If yes] Regression relative to OS version:
Is it a Regression: Not sure
[If yes] Regression introduced in release/build:
[If yes] Test result on FCS: Pass/Fail
Test result on FCS: Pass/Fail(No FCS build released)
Test run log location:

Steps to reproduce:
1. launch case of set1u-38 with IE8 or IE 7
2. loads url:
http://www.miniclip.com/games/puzzle-pirates/en/ ,the java console displayed.
2.Click 'CREAT YER PRIVATE' on applet window and next,input some string in
'name' text,then continue click 'play now',it will load a applet.

#Actual Behaviors:

Exception is thrown in start and init method,step2 couldn't finish and no
response.Pls see attached.

#Validation:
1.same configuration/64-bit jre 6u18-b02/IE8
  pass

2.x64- Windows 7 Ultimate(RTM)/32-bit IE8/jre 6u18-b03
  same problem

3.x64- Windows 7 Ultimate(RTM)/FF 3.5.3/jre 6u18-b03
  pass

4.x64- Vista Enterprise(sp2)/64-bit IE8/64-bit jre 6u18-b03
  same problem

5.x86- XP home(sp3)/IE7/jre 6u18-b03
  same problem

6.x86- XP home(sp3)/IE6/jre 6u18-b03
  same problem

#Exceptions:
see attached 'puzzle-pirates.txt'