Same issue here with an Nvidia GeForce FX 5200 card and the nouveau driver enabled. I did not change anything within the compiz manager, just freshly installed Ubuntu 11.04. The side panel remains black, but the applications are clickable. Resetting Unity with "unity --reset" does nothing. When switching to Unity 2D the panel works fine. I have added a picture.
Same issue here with an Nvidia GeForce FX 5200 card and the nouveau driver enabled. I did not change anything within the compiz manager, just freshly installed Ubuntu 11.04. The side panel remains black, but the applications are clickable. Resetting Unity with "unity --reset" does nothing. When switching to Unity 2D the panel works fine. I have added a picture.