LibreOffice apps spinlock, eat memory and never start

I installed LibreOffice 5.3 on a Windows 10 x64 machine. For a brief period it seemed to be working fine, and then got to a point where when it is started, it uses an entire CPU core (and then some) and eats memory. The UI never presents itself.

I’m opening it by click on the start button, typing ‘calc’, and then selecting LibreOffice Calc.

This happens on both Writer and Calc. The machine is a fairly fresh Windows 10 x64 Home install.

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How can I diagnose this or get LibreOffice to a point where it works?

Try resetting user profile.