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Dock weirdness

I noticed some weirdness on my MBP laptop yesterday evening. When I would CMD-tab to go from program to program, none of my other programs were there. I googled this and the best suggestion I saw was to restart the dock. From the terminal I issued the command killall -KILL Dock. The dock restarted and everything was fine. I'm not sure what caused it but I was working with some heavy graphics in Photoshop, so that may have had something to do with it.