I'm using Build 8.0.18314 of PD 8, I've already spoke to support about this issue without any success. Basically a large number of Windows 8 shortcuts don't work. For example to display the charms bar the shortcut is Win+C. In PD 8 the mapping for this shortcut is ALT+CMD+C however this doesn't work instead I have to use FN+CMD+C. In fact any of the default keyboard maps with a combination of ALT+CMD+... don't work and you have to use the FN key in place of the ALT key. Support just suggested resetting the default mapping however this had no effect and I han't customised the defaults. I should also say that the Windows 8 install is fresh its not a VM that's been upgraded.