SketchUp 2018 pro suddenly won't start up

I expect Steve has hit the nail on the head. Bug Splats on startup are typically graphics driver related. Intel graphics adapters and their drivers are not great at best and Microsoft frequently pushes driver updates that are broken. Rolling back to a previous driver version is a good idea. Or go to the Intel site and install the latest driver directly from them instead of using the one pushed in the automatic update.

Note that integrated Intel graphics are not recommended for SketchUp.See:

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