All right then - I removed the [SOLVED] tag.
This might not have anything to do with it but just a thought...if you go to system settings,privacy is record activity turned on?
Dell XPS 8300, Intel core I7-2600, 12 GB ram, 2 TB HDD, AMD Radeon 6770, Soundblaster X-fi Xtreme, Dell 24" monitor, Ubuntu 12.04 and 12.10-testing
I've seen similar issues resolved by deleting
I am not able to find "privacy" under system settings.
Deleting this directories didnt help.
I have already filed this as a bug in Launchpad (https://bugs.launchpad.net/unity/+bug/987689).
I dont have this package installed...
I removed (with --purge) and (re)installed the two packages: unity-lens-applications and unity-lens-music (with related packages). Then the application and music tabs were restored after the system reboot (logoff is sufficient).
Thus I feel that these two applications (and unity-lens-video) should have dependency with dash. Of course it depends on the individual's point of view. In any case this thing should at least be documented somewhere.
@ Others affected by this bug:
Can somebody confirm whether this solution works for you?