How can I reset Compiz settings to default?

Execute the following command and then re-login:

rm  -rf ~/.compiz-1 ~/.config/compiz-1

The script is now bundled with Unity Tweak Tool. You can install it using

sudo add-apt-repository ppa:freyja-dev/unity-tweak-tool-daily
sudo apt-get update
sudo apt-get install unity-tweak-tool

To reset Unity, do

unity-tweak-tool --reset-unity

You probably are missing this last command:

unity --reset-icons

Look at this link:

http://www.liberiangeek.net/2013/04/how-to-restart-unity-and-compiz-in-ubuntu-13-04-raring-ringtail/

Hope it helps

Thanks