Possible Duplicate:
How do I reset my Unity configuration?
After I upgraded my Ubuntu 11.04 (that I had Compiz) to 11.10 and did some navigation in CompizConfig Settings Manager, suddenly the main top panel and left launcher disappeared and I just have windows menu at the top instead of master panel (master panel = top panel that have shut down , time and date , chat and ...).
But it still working in Ubuntu 2D.
How can I reset my Unity and why did this happen?