Created attachment 267009 [details] corrected accountsservice-0.6.6-r1 ebuild The accounts-daemon installed by sys-apps/accountsservice-0.6.6-r1 (from gnome overlay) uses the /var/lib/AccountsService/users and /var/lib/AccountsService/icons directories to store users' preferred desktop sessions, language choices, and icons. If the ebuild does not create these directories (and it currently does not), accounts-daemon (and the applications that make use of it, such as gnome-3's gdm and gnome-control-center) will fail to save user preferences properly. The attached ebuild correctly creates these directories.
We just need to pass --localstatedir=/var, the build takes care of those directories. This is now fixed in the overlay, thanks for reporting!