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7020100
(Get the code!)
I'm running Ubuntu 12.10 with Unity 6.6.0, and I have faced this problem as well. I can confirm that I was too running a virtual machine, when this happened. Specifically, I was running a Ubuntu 12.04 VirtualBox image (set to not exclusively capture keyboard and mouse). One behavior I noticed was that tapping the Super or Alt key would open up both the host's and guest's Dash or HUD, respectively. This is somewhat expected, I guess, but sometimes annoying.
I did not notice exactly when the host's HUD became permanently visible, but it has stayed there even after I closed the VM. Attached screenshot shows that the HUD is as if painted on the screen, but not really alive, i.e. I cannot type anything into or close it by tapping Alt (strangely, the cursor even blinks sometimes). Elements from other windows (in this case a terminal) get drawn on top of the HUD, and then sometimes the HUD gets drawn on top (typically when the other window loses focus).
I haven't experienced any such problem with the Dash.