My computer randomly forgets that I prefer to use Folder View.
When this happens, it seems to think it's in folder view, i.e. Folder View is shown as being selected, but the desktop is empty. I can get around this by selecting Layout = Desktop and applying it, then selecting Layout = Folder View and clicking 'OK'.
That's fine until the next reboot, when there's a good chance that the desktop will again be empty.
How can the computer forget? Forgetting things is my job...