Sun Oct 21 2018 12:06:08 UTC
I've stopped it crashing. It was bombing out at an 'assert' line,. Removing it fixed it!
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ID Product Component Assignee Status Resolution Summary Changed
229931 Ports & Packages Individual Port(s) pfg New --- cad/calculix: doesn't build after 2.14 update 2018-07-22
One bug found.

as

File a new bug in the "Individual Port(s)" component of the "Ports & Packages" product