Today I noticed that the System Preferences icon in the Dock has a red badge (containing a white '1' digit).
I presume the app or the computer is trying to tell me something, but I can't figure out what that is. I tried opening the System Preferences app in the hope that it might badge or highlight the preference pane icon concerned, but everything looks normal.
I've tried clicking on several of the preference panes, but the badge stayed. I suppose I might try clicking on every single one of them and see if or when the badge might go away, but I wonder if you might have seen something like this. Another thing I haven't tried yet is to look in Console.