I have a 15" Retina MBP, and Fusion 5.02 would crash Windows 7 when running Google Chrome with OS X 10.8.2. I just upgraded to 10.8.3, the recently released firmware update, and Fusion 5.0.3. I've tried running a few stress test sites (lots of HTML5 Canvas) with the new combination, and have had no further crashes. Plus, the overall graphics performance under Windows 7 is faster when running in Unity mode, e.g. dragging a Windows 7 window across the Mac desktop is quite a bit smoother, though still not as smooth as running in single-window or full-screen mode. My only complaint is that when in Unity mode, dragging a window with the Windows Aero theme shows the background of the Windows desktop, not that of the Mac. I also tried the same tests with Chrome in a Windows 8 guest, and all is well.
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