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I haven't moved to Yosemite yet, but it changed the zoom button to act as full screen. I think that that's what you mean. To return from that, move your mouse pointer to the top of the screen to show the menubar, and you'll see the window buttons again. Press the green button one more time to return to the regular multi-window mode.
The new Mac Pro has up to 30 MB of cache inside the processor itself. That's more than the HD in my first Mac. Somehow I'm still running out of space.