Dock not showing up intermittently

I first noticed this issue when I downloaded a preview/beta version of Mavericks a few months ago. It was so annoying that I thought it is definitely going to be fixed when the final version is released. However, sadly it is still there: every now and then, when I move the mouse pointer to another display to where it should force the Dock to show up, the Dock won't show up at all. It doesn't even matter which screen has the focus right now either. Can happen just intermittently. Moving the pointer up and down a few times will eventually make the Dock appear.
I also noticed that this can happen wihin my currently active display as well: my Dock is hidden by default, but when I move the mouse pointer to where it should force the Dock show, yeap, nothing happens.
Anybody else experiencing this behavior? This is very annoying.

The picture is becoming more clear...
When I booted up tonight, the dock was gone again. This time, before rebooting, I went into Display prefs and, sure enough, it thought I had two displays. When I clicked on the Detect Displays button, it realized that I only had one display and everything went back to normal.
So now the question becomes...
Why does OS X occasionally think I have two displays?
Joe

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