I don' know what changed, but I kept Unity disabled these days (I needed a 
"stable" system) and when I re-enabled it, unity-place-applications was working.
I'm trying to reboot, now; I did what you asked right after re-enabling, so I'm 
not sure that unity-place-applications is working because of it or if it's just 
working.
If it works, I'll close the bug; for the records, that's the output you asked 
for:
=====================================================================
claudio@Jarvis:~$ pkill -f unity-applications-daemon 
claudio@Jarvis:~$ /usr/lib/unity-place-applications/unity-applications-daemon 
Error loading package indexes: Couldn't stat '/var/cache/software-center/xapian'
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:341: Building 
initial application menu
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:362: Indexing 
application menu
(process:17092): libunity-DEBUG: unity-place.vala:772: No browser to export
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:229: Sections 
model already populated. We probably cloned it off Unity. Rebuilding.
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:246: The groups 
model already populated. We probably cloned it off Unity. Rebuilding.
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:246: The groups 
model already populated. We probably cloned it off Unity. Rebuilding.
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:431: Entry search 
listed 251 Installed apps in 9,741000ms for query: type:Application
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:455: Entry search 
found 20/648 Most Used apps in 87,332000ms for query 'NOT category:XYZ'
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:431: Entry search 
listed 0 Installed apps in 0,174000ms for query: type:Application AND ciao
(process:17092): unity-applications-daemon-DEBUG: daemon.vala:455: Entry search 
found 0/0 Most Used apps in 1,961000ms for query 'app:(ciao*)'

** (process:17092): CRITICAL **: UnityPackageSearchResult*
unity_package_searcher_search(UnityPackageSearcher*, const gchar*,
guint, UnityPackageSort): assertion `searcher != NULL' failed

(process:17092): unity-applications-daemon-CRITICAL **: 
unity_applications_place_daemon_add_pkg_search_result: assertion `results != 
NULL' failed
Errore di segmentazione (core dump creato)
=====================================================================

The last line is the italian translation of "Segmentation fault (core
dump created)".

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https://bugs.launchpad.net/bugs/728301

Title:
  Unable to search for applications

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