I've noticed the same issue as
Proxin, until I realized that it happened when I launched
gedit as root (using 'su -' in a terminal window, then running gedit from there). Certain programs seem to cause
/usr/libexec/gnome-settings-daemon (I think that's the one) to start up for 'root', and then gnome-shell seems to use root's default settings. As root, I made several changes using gsettings, like:
Code:
gsettings set org.gnome.desktop.interface clock-format 12h
which seems to have taken care of most of the problems. I don't recall if killing root's
/usr/libexec/gnome-settings-daemon made things like the clock format go back, since I also learned not to launch those programs as root anymore
Every once in a while, some programs also lose their settings (like window size). Killing my normal user's
/usr/libexec/gconfd-2 (which usually respawns itself) normally takes care of it for me. One way I've found to tell it's time to kill is one window (usually gnome-terminal) will take up the background of the "Activities" view, instead of being 'tiled' like the others. I'm not sure if my description is very clear (unless you've seen it too), but I don't have a screenshot of that to post (I try to get one the next time I see it).
It may or may not be relevant, but I normally just 'suspend' (sometimes 'hibernate') my laptop instead of logging out and/or powering down. At least, until there's another kernel (or other important) update.