In the latest version of Lightroom, I've noticed that the Show Grid Extras value is not being saved when exiting LR. When I modify it from the dialog box (clicking the check box that says "Show Grid Extras") and then exit LR, it's not checked when I restart LR. However, using the keyboard shortcut "J", DOES save it between runs. It also seems that the keyboard shortcut behaves differently than it used to, cycling between expanded, compact with no grid extras, and then compact WITH grid extras, though this last bit could be my imagination.
In any case, just a little annoying.
Was Lightroom working fine before the update?
May I know which operating system are you using?
You can try resetting the preferences of Lightroom