Q: I have an older NEC MultiSync LCD 1700V monitor. I'm having trouble getting it to work with my MAC BOOK Pro with Mavericks. Is the ... I have an older NEC MultiSync LCD 1700V monitor. I'm having trouble getting it to work with my MAC BOOK Pro with Mavericks. Is the monitor outdated? more
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May 7, 2014 5:10 PM in response to RSB1234by Grant Bennet-Alder,10.9 Mavericks changes the way displays are treated, and the new default is that each display is an independent workspace. This can be put back to the "correct" Extended Desktop way.
Windows in Mavericks reside in a single space by default, so they usually don't span multiple displays. When a window is dragged between displays, it appears translucent on one of the displays to indicate this. After you are done dragging the window, it snaps to one display.
If you need an app window to span multiple displays, deselect the option "Displays have separate Spaces" in the Mission Control pane of System Preferences.
--from:
Mac OS X: Using Multiple Displays in Mavericks
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