I'm running Arch in VBox under Windows and I'm getting similar behavior since I've upgraded xorg-server, xorg-server-common, libinput. I had updated the kernel in a previous step and I don't remember seeing this behavior after upgrading just the kernel (and not xorg-server). I've logged lipinput generated events and they seem ok (all mouse activity is captured by the kernel/libinput driver). However, testing the xorg events (xev) seems consistent with X behavior: no events comming to X from libinp. Another thing: my keyboard input also got stuck for a couple of times. Therefore, maybe we should log a xorg-server bug? P.S.: One partial workaround (making the left-click work): find a region/window where the right-click works and right-click. After that you have a chance of getting the left-click working for a limited (single?) left-click event.
