I discovered what was making my Win7 VM hang up with 6.0.1 and Mavericks.

[memphisgeek]

I was having issues with my Win 7 VM totally locking up and shooting my Air's CPU through the roof.

I had read somewhere where someone was having issues with an app and Mavericks' App Nap feature.

So I right-clicked on the Fusion app bundle in Finder, clicked on More Info, then checked the box in General that says "Prevent App Nap".

My VM is solid now.

Maybe someone could KB this "feature"?

@toddw

[sdoughtie]

THANKS!!! That fixed my problem!

[Coach300]

I did a post on this "feature" earlier today and I, on a hunch, opted to "prevent App Nap" for VMWare Fusion and I believe that may well become a "best practice". An app nap could even halt a startup (because, after all, we enjoy watching paint dry as much as we do Windows starting up).

While I didn't mention VMWare Fusion by name, I sent a message on to Kim Komando about this "prevent' feature, perhaps it may make its way into a reader question or tip or "exclusively Mac" newsletter she sends out rather frequently. Look for it.

[tonyfirshman]

Thanks - solves my lockup too. Route though is different for me - right click on the .app -> 'Get Info' and check "Prevent App Nav".

[barlettpsj]

I thought mine was fixed too after disabling app nap, but just got back from a break to find my Windows 7 VM hung.  Cpu at full wack and not responding (Cmd-Ctrl only to get the mouse back to zap Fusion --- Cmd-Q did nothing).  I hope they fix this soon.  I had no hangs with Mountain Lion and Fusion 5.