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I have two VirtualBox VMs running headless and they run all the time. A third VM (Windows 7 x64) runs on my desktop in the VirtualBox GUI and is sometimes not used for hours or days.

Ever since I upgraded to VirtualBox 4 I find that Windows VM paused when I switch to it.

Any ideas why VirtualBox would pause my VM without me telling it to?

Mac OS X 10.6 Xeon.

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Maybe the guest is putting itself to sleep? I don't know VirtualBox, but it may have grown new sleep mode features that the guest is now using. –  Keith Feb 13 '11 at 18:39
    
That was it! Repeat it as an answer and get the points. –  Andrew J. Brehm Feb 13 '11 at 22:01

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