I don't know how I did it, but I have a screenset in which the Multidock has collapsed to a thin bar at the bottom of the screen with "MULTIDOCK" in caps written on it. The "collapse" arrow does nothing and there doesn't seem to be a way I get get it back. Tried D and shift-D. Tried double clicking, tried dragging. What hath God wrought? 

Is there anything in it?

is there any view docked in that screen?

It sounds like the MultiDock might be empty. Try opening a view (like the Console view) and see if that pops the MultiDock open. 

Scott 
-- 
Scott R. Garrigus - http://garrigus.com
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Ha! That was it. Somehow I must have closed the console view without realizing it. I never close it as a rule so not sure when I did that....