Unity Lenses Missing (files/folders, applications)

The File & Folders lens and default Applications lens is missing from my dock. How can I get them back?

I attempted the guide here: http://www.webupd8.org/2011/04/how-to-reset-unity-launcher-icons-or.html

All the icons came back except the two missing lenses. unity-place-applications and unity-place-files are both currently installed.

Solution 1:

• Make sure you have those packages installed:

  unity-lens-applications
  unity-lens-files
  

• Make sure you have those two files in /usr/share/unity/lenses:

  applications.lens
  files.lens
  

• If it still doesn't work, try to reinstall the two packages:

  sudo apt-get purge unity-lens-applications unity-lens-files
  sudo apt-get install unity-lens-applications unity-lens-files
  

• If it still doesn't work, I suggest reporting a bug report:

  ubuntu-bug unity # if unity is the wrong package, others will fix it