On 30/11/17 18:45, solitone wrote:
The only other suspect I have is apparmor, which was installed in a recent security update. But can this be the reason?

Yes. For example:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882043

Kind regards,

--
Ben Caradoc-Davies <b...@transient.nz>
Director
Transient Software Limited <http://transient.nz/>
New Zealand

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