Hi,
I ran the app in Chrome and Firefox for a few minutes each, and IE10 for the better part of the afternoon on my Win7 x64 machine yesterday and did not see a crash with 11.8.800.94.
If you disable Hardware Acceleration in Flash (Right-click on a SWF, choose Settings, click the left-most tab and uncheck Use Hardware Acceleration), does the crash persist?
If you don't see the crash with hardware acceleration disabled, can you send me the output of Dxdiag? (Start > type 'dxdiag', click 'save all information') That will help me find comparable hardware to look at.
Thanks,
Jeromie