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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