After an upgrade a few days ago, which included an update to xf86-input-synaptics-184.108.40.2061-1, I've lost the ability to right click by clicking with two fingers. Interestingly, I can still right-click by /tapping/ with two fingers, and everything else is working unaffected (including two-finger scrolling). Any hints as to what triggered the change, and how to fix it? Various searches shed no light on this.
Nothing interesting is in Xorg.0.log, xinput's output seems ordinary, and I don't see any options offered by synclient that would change this behaviour. Anywhere else to look? (I'm about to try enabling shmconfig and see what synclient -m gives.)
(I'm not a fan of mtrack at all; I'd much rather get the input-synaptics stuff working properly again.)