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The log is attached. I didn't bother compressing as it isn't that big.

Thanks for the reply. I disabled app nap for VirtualBox as well as VirtualBoxVM.app Does this have anything to do with power nap? I don't have that enabled. Lets hope this helps. So I thought this may have something to do with the display driver installed with guest additions. However, the problem h...

thanar wrote:First off, what's the GUEST OS?
What if you try switching out of fullscreen (HOST+F) and into fullscreen again, after the VM screen blackout happens? Doesn't it come back?

Windows 8.1 is the guest. Mac OS 10.9.2 is the host. I'll try switching in and out of full screen and report back shortly.

Hello all, My host is Mac OS 10.9.1. VirtualBox is at 4.3.8. Prior to installing guest additions I had no video issues. After installing them, my 8.1 guest works fine until either the guest turns the display off due to power saving functionality or the Mac turns its display off. I disabled all power...