Unity search won't find any apps

[NoBugs!]

The Unity search won't find any apps sometimes. Right now I'm not able to see gimp, synaptic, firefox, nautilus, ANY apps, either from the home or applications section of Unity.

It shows "Sorry, there is nothing that matches your search" no matter what I type.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity-lens-applications 7.1.0+13.10.20131011-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
Uname: Linux 3.13.0-40-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
Date: Thu Nov 27 08:27:14 2014
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-11-23 (369 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
ProcEnviron:
 LANGUAGE=en_US
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-lens-applications
UpgradeStatus: Upgraded to trusty on 2014-04-19 (222 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.