Can't set up extended desktop in Mavericks

I can't seem to join my two displays (MacBook Air display and external Cinema display) into a single extended desktop. Worked fine in Mountain Lion.
Does anybody have a solution? The onscreen help is no help.

OK ... after logging out and back in, the fix above from captfred worked. That fixed my main problem, in that I can now run Citrix Receiver across both monitors.
New problem ... I think. With the settings changed, when I go to fullscreen mode in an app (such as Safari), it fills up one monitor and the other goes blank, just like they did in Mountain Lion. Anybody else seeing this?
The new problem isn't a huge deal, but I can't believe that Apple didn't make the new fullscreen behavior in Mavericks work regardless of whether a space covers one or two monitors.

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  • Extended Desktop on 2 Computers

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    No,
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  • How can I set up an external monitor to extend my screen in windows 7 bootcamp?

    How can I set up an external monitor to extend my screen in windows 7 bootcamp?  I have updated bootcamp to the latest version.  The monitor I have works while I am using Mac OS X. While in bootcamp the monitor is dectected and I am able to select the settings and displays however the external monitor remains alseep.  I hooked it up using a mini display port to VGA adapter.  Any suggestions?
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    On your Windows desktop right click and select Screen resolution from the menu. You should see a window like this:
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  • Can my extended desktop on my iMac be treated as a separate desktop vs just an extension ?

    When I plugged in an external monitor via thunderbolt to DVI cable, I was hoping to gain an additional view of the various desktops.  instead I got an extension of my current desktop, which is really cumbersome to move through various appellations i have open, e.g. Fusion 6.0 seems to want to stay on all the desktops I swish through.
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    Hi markpaq, 
    Welcome to the Apple Support Communities!
    With an external display, there are two different arrangements you can set. You can either use a mirrored display or extended desktop. Please use the attached article for more information on configuring your external displays. 
    OS X: How to use multiple displays with your Mac in Mountain Lion and earlier
    Have a great day, 
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