[Report]Forge Beta version 1.5.0 frequently freezing

Forge version:1.5.0(Beta)
My PC:
OS:Windows 7 32 bit
Cpu:Dual core E6300@2.80ghz
Ram:2.0 gb
Vga:none(on-board Intel vga)
Java runtime version:latest version(JRE Java 7 update 40 ,32 bit)
Replicate bug:Yes,playing for a long time(around 4-5 matches)
Note:
*It seem like it happen more frequently since I downloaded card picture.
*I also start the program by clicking .exe file as the README.txt suggested
My PC:
OS:Windows 7 32 bit
Cpu:Dual core E6300@2.80ghz
Ram:2.0 gb
Vga:none(on-board Intel vga)
Java runtime version:latest version(JRE Java 7 update 40 ,32 bit)
Description:Program randomly freezing after playing for a while.There is "OK" button to change to next phase but after I click it nothing happen.Program wouldn't let me go the next phase(see screen in attachment),though it look like another component still perform well,for example,I can switch from Prompt panel to Ante panel and Dock panel , I can still re-arrange each panel position,I can click each menu on menu bar(Forge,Game,Layout,Help) and it perform each of its function normally.Noted that there are no popup error report from the program.I click close button but nothing happen so I killed it from Task Manager(There are no blue-screen or whatever,I just need to kill it myself).java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) Client VM (build 24.0-b56, mixed mode, sharing)
Replicate bug:Yes,playing for a long time(around 4-5 matches)
Note:
*It seem like it happen more frequently since I downloaded card picture.
*I also start the program by clicking .exe file as the README.txt suggested