This bug is relative to upgrading a project with Hololens support.

You'll need Unity Editor with Metro Editor Extensions available and Hololens target selected.

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FBX hangs on importing assets from project found at https://oc.unity3d.com/index.php/s/jeDSZtvuklf3jtF

Email snippet from user:

"We use it for some automated tests, but we haven’t been able to import it into the latest 5.6 unity editors due to a hang importing an fbx (though not always the same one, currently I’m seeing LxpContent\RoundUp\Models\Orbus_retryButton_msh.fbx hang). It would be great to use our project for automation again, though also other users are likely going to get bit by whatever if afflicting us (and this is the only project we know of having the problem… which is weird)."