Ubuntu 12.04 unity problems

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http://askubuntu.com – I'm using Ubuntu 12.04 64 bit and it was all fine until last week. Now, there are several problems that I'm encountering: I cannot change my desktop background. Application lens is installed, but no applications are shown in the dash. Following are the things I've tried: Installing unity-place-applications and unity-place-files. Resetting unity using unity --reset and unity --reset-icons commands. Deleting some configuration files present in my home directory. Creating a new user. Also, Empathy always shows offline contacts the next time I log in, even if untick the Offline C (HowTos)