Can't access the Applications folder
I sometimes can't access the Applications folder from the Finder sidebar.
The Applications folder is also faded out in 'Macintosh HD'.
The only way I can access it is by using the Cmd+Shift+A shortcut or by going into the 'Go' tab in Finder.
iMac, OS X Mountain Lion, mid-2011, quad-core i5 2.5Ghz, 16GB