Invalid jar file IOException and pogo games won't loaded on 7u10 b08

J2SE Version (please include all output from java -version flag):
java version "1.7.0_10-ea"
Java(TM) SE Runtime Environment (build 1.7.0_10-ea-b08)
Java HotSpot(TM) Client VM (build 23.6-b03, mixed mode, sharing)

Does this problem occur on J2SE 6ux or 7ux? Yes / No (pick one): Yes



Operating System Configuration Information (be specific):
Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.100427-1636)

Windows 7 Ultimate 32-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_rtm.101119-1850)


Hardware Configuration Information (be specific):

System Manufacturer: Dell Inc.
       System Model: OptiPlex 380
               BIOS: Phoenix ROM BIOS PLUS Version 1.10 A02
          Processor: Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz (2 CPUs)
             Memory: 2012MB RAM
          Page File: 1360MB used, 2544MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.5512 32bit Unicode

Bug Description:
Load a Java game with Java version 1.7.0_10-ea-b08, after the Pogo progress bar runs to full, the screen shows "Please wait, loading...". Then the game hangs up there. After a very long time (> 5 mins), the game may be loaded successfully, but it's rare. There is an IO Exception in the Java log called "java.io.IOException: Invalid jar file" which happens frequently.


Steps to Reproduce (be specific):
1. Open http://www.pogobeta.com/games/risk with Club/Free/Guest user and Java 1.7.0_10-ea-b08 installed.
2. Launch the game and observe the game won't be loaded.