[Built with UDK has stopped working]

This happens to me as well.

New laptop (MSI GE70), Fresh Windows 8 install upgraded to 8.1, fully patched with all latest drivers and new DirectX install.

I played through the game OK but shortly after the game ended I got this Built with UDK Has Stopped Working error, presumably while trying to switch to a new map? Here's what I captured from it:

Problem signature:

Problem Event Name: BEX

Application Name: UDK.exe

Application Version: 1.0.10907.0

Application Timestamp: 51d1d22f

Fault Module Name: StackHash_1b4b

Fault Module Version: 0.0.0.0

Fault Module Timestamp: 00000000

Exception Offset: PCH_5A_FROM_ntdll+0x0003C1AC

Exception Code: c0000005

Exception Data: 00000008

OS Version: 6.3.9600.2.0.0.768.101

Locale ID: 1033

Additional Information 1: 1b4b

Additional Information 2: 1b4b3277d5639d783fe8983169f06ef3

Additional Information 3: a75b

Additional Information 4: a75ba374119e7016e553ffea03e62b5b

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