On OSX, when you have different monitors with different pixel densities, i.e. when you have a Macbook Pro with Retina and an extrenal display, as you drag applications between the montors, the OS scales the window and the assets. This never happened with the Parallels Desktop 8 window. If you set the VM to be 'scaled' then it will look normal on your external monitor, but very blurry on your HiDPI (or retina) display. Likewise, if you set the VM to be 'full size', then it will look great on your HiDPI screen, but very small (Parallels zooms everything out 50%) on your normal display. All that needs to happen is that PD needs to paint its window differently according to the DPI of the screen its on. Is this fixed in PD 9? Now that per-monitor DPI scaling is build in to Windows 8.1, this feature would be even better. But it would still be appropriate to work on Windows 7 / 8. Thanks
Basically, when selecting 'more space' in PD, it should just always display the window at 1:1 pixel ratio. Instead, it displays that fine on the retina display, but does a 2:1 pixel ratio on non-retina displays, making the window very small and zoomed out.