Dear all. (CC: to #823372, #821352 and #825100 since I believe all these bugs should be merged.)
I have the same problems (see attached screenshot), namely: 1) The mouse settings panel does not appear complete any more. 2) All customization (natural scrolling, primary button, touchpad's touch-twice-to-click...) is gone. Contrary to other people, this bug did not manifest immediately after upgrading to GNOME 3.20 (something I did around ten days ago), but only around three days ago. I am trying to generate the list of installed packages (reportbug is somehow malfunctioning). However, for your information I am using (mostly) testing. For now, enjoy my screenshot. Best, Leandro