I have 2 devices. 2012 MBP, and a 2013 rMBP. Both running Mavericks, both have identical settings, which include hiding the dock when not in use, and showing it when i mouse over it on the bottom. On my rMBP when i 3finger swipe up to show all open windows, the bar also appears. On my MBP when i do the same thing, the Dock remains hidden. I really prefer it to show when i 3finger swipe to see all windows, I can then see if i have the right browser open, and in case I dont I have very quick access to hit the right icon on the dock. Any advice?