In the last couple of days I've been able to quit Finder - Cmd Q and my icons dissappear. It does no harm, but is a bit unnerving, and I don't remember being able to do it before. The first time I thought there was something seriously wrong and restarted but it's still there. Anyone else having this issue? I'm just wondering if it's indicative of a problem that is gradually brewing in the background that I should do something about.