Sprayfly

After messing around with custom kernels today on my Ubuntu installation I noticed that Cairo-dock was no longer transparent and that there was a black background underneath it as I mouse-over the dock.

It turns out that this is due to compiz effects not being enabled in Ubuntu.

To enable compiz:
Right Click on Desktop –> Change Desktop Background –> Visual Effects –> Check the Extra Box

You should now have the transparency back again.