Workarounds for Unity 4.2+ crashes on Windows 8.1

If you are experiencing crashes or hangs in Unity 4.2 or 4.3 running on Windows 8.1, particularly when importing assets or transferring over an older project, take a look at this:

We've hit this issue on a couple of systems.   Usually, we can get around the problem by setting the "-force-d3d11" tag on the Unity icon start arguments.   Which seems to work on the desktop icon, but not if you pin to the taskbar, which is annoying.

It is also a good idea to make sure DirectX and graphics drivers are up-to-date, which seemed to help on one of our systems.