On lightdm pressing the Switch User button does nothing. dm-tool switch-to-greeter switches to the greeter, but does not seem to lock my current account. Is there any way to fix this, or even to debug this?

In /var/syslog I seem to get this error: (gnome-shell:1303): mutter-WARNING **: STACK_OP_RAISE_ABOVE: window 0x6701a00016 not in stack which seems related.

I am running debian jessie.

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