Apps do not appearreliably in Dash

[honkitonk]

Ubuntu Release: 14.04

reproduction:
1. hit Super (Windows) -> Dash opens and apps and folders/files are shown
2. type one letter e.g. "t" -> apps and folders/files with "t" are listed
3. press backspace -> only folders/files are listed
4. type one letter e.g. "t" -> only folders/files with "t" are listed
5. press backspace -> apps and folders/files are listed
6. continues like 2.

So depending on what is shown before typing, there are only folders/files listed or apps are visible too.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.1+14.04.20140513-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
Uname: Linux 3.13.0-27-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Thu Jun 5 15:11:38 2014
InstallationDate: Installed on 2014-04-18 (47 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)