Solved thank you in a rather strange manner. I noticed in the systemd journal that the core was dumped directly after a complaint about an AMD Catalyst library. I changed from an AMD to Nvidia card fairly recently, and I had managed to leave a couple of Catalyst packages on the system. Removal of these sorted my problem.
BTW, just to defend ArchLinux, the package maintainers usually do a conscientious job keeping up to date etc. I rarely find anything broken. However, I understand your reasons for prefering people to use the official binary. Thanks for replying, and keep up the good work.
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