I have this problem with ADW where my dock bar will randomly disappear. It's not HIDING, it literally disappears. The only way to get it back is to restart my phone.
I recently updated with GB and I wanted to play around with the stock desktop, or possibly a different launcher program. Do I have to uninstall ADW or is there a way to turn it off? And are there any recommendations for a "better" launcher program than ADW?
You can also long press on the desktop and bring up the launcher actions and place an open/close dockbar icon on your desktop. It's a pain but it is a fix that doesn't involve shutting down phone. I have the same issue on occasion.