Linux Mint 12 is very good, but I'm having a very "strange" issue about Gnome 3. When I click on the "infinity" symbol or going with mouse cursor to up-left of the screen, it's alright: it opens Gnome 3 Menu. Well, unfortunately sometimes, when I go to Gnome Menu, this DE freezes. I can move cursor, but I can't do anything, I have to clic CTRL+ALT+BACKSPACE to restart X-Server. I noticed that this error occured when I left Mint inactive for minutes, I try to open Gnome 3 menu, then freezes.