The source code to build the Engine that is available from GitHub includes the file dbghelp.dll, which prevents the crash reporter tool from starting on Windows 8.1 machines. This file is not present in the binary version of the Engine, and the crash reporter tool works fine in that instance. Removing or renaming this file appears to allow the crash reporter to function normally.
Instead of the crash reporter tool, you will see an error message stating:
The procedure entry point SetCheckUserInterruptShared could not be located in the dynamic link library
The crash reporter tool appears.
Head over to the existing Questions & Answers thread and let us know what's up.