I've found twice when restart my air(2013),the folder ~/Library/Application Support/ lost and many apps has to reconf such as the wallpaper,iCloud,crossover and so on.OS X Mavericks 10.9.2
MacBook Air (13-inch Mid 2013), OS X Mavericks (10.9.2)
In Applications > Utilities, open Disk Utility. Click on Macintosh HD in the left pane and click the Repair Permissions button at bottom of the right pane. If it reports any errors, repeat the Repair until there are no errors. See how it behaves and reply back if you still have problems.
If I guess it right, you must have uninstalled some apps from Launchpad or Application folder.
same issue here.
Up to now, I have to say, nothing helps!
I am now suspecting it's a HUGE system bug.
You may contact apple, providing my Case ID: 600227055 as reference.
Keep us updated, if you find any solution. Thanks!
Hey buddy, I am afraid you might need re-install your system. see this
~/Library/Application Support/ folder sometimes somehow is reset
~/Library/Application Support/ folder lost sometimes when restart
