Problem signature:
Problem Event Name: APPCRASH
Application Name: devenv.exe
Application Version: 9.0.30729.1
Application Timestamp: 488f2b50
Fault Module Name: KERNELBASE.dll
Fault Module Version: 6.1.7601.17965
Fault Module Timestamp: 506dbe50
Exception Code: e0434f4d
Exception Offset: 0000c41f
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 4105
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789
Possibly related to bug #3147
Had the same problem with WiX 3.7.1224.0. Here's the output from our build machine.
Expect this to be fixed in next build of the WiX toolset (v3.8).