I just started my macbook pro - it was working perfectly earlier today. So I log in and my Dock (where dashboard, finder, etc - all the apps icons) are is different- it has reverted back to I think defaults!! For example firefox is gone, things that i've removed from the dock are back... Then my icons on the desktop are all messed up. They were no longer "snaped to grid" nor arranged by date created like I originally made. What happened!!??