4.16 crashes whilst trying to load updated project

Version: 4.16.0-3452394+++UE4+Release-4.16 running on macOS 10.12.5

Whilst opening a project which worked fine under 4.15, the engine gets to the point
where the editor screen is visible, displays a message about Assets and then hangs.
Computer has to be rebooted. Other projects have transferred fine. This one has
different lighting than the others.

Any help or advice would be appreciated.

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