How to fix gray files in Finder?
This solved it for me!  http://macadmins.psu.edu/news/2011/06/grayed_out_finder_folder 


  So, what happened? It appears that the folder's creation date was set
  to a random date in 1943.  While we are unsure of how it happened, we
  did figure out how to fix it. 
  
  We used a few binaries that came with the Developer Tools, GetFileInfo
  and SetFile. GetFileInfo showed us the creation date of the folder. We
  overlooked it at first, but with closer examination it caught our eye.
  
  $ GetFileInfo Test/ directory: "/Users/user/Desktop/Test" attributes:
  avbstclinmedz created: 06/13/1943 06:13:00 modified: 06/13/2011
  15:07:33
  
  We then could change the creation date using the SetFile tool.
  
  $ SetFile -d 06/13/2011 Test/
  
  After seting the date back to a reasonable time, we can see that it
  has truly changed.
  
  $ GetFileInfo Test/ directory: "/Users/userid/Desktop/Test"
  attributes: avbstclinmedz created: 06/13/2011 06:13:00 modified:
  06/13/2011 15:07:33
  
  The folder then showed properly in the Finder and was again usable. We
  also found that if you created an alias of the folder, you could see
  the data and move it out. Once it was moved out into another folder,
  the old folder could be deleted.