I use a VAIO VPCZ13 with dual graphics card (Intel and NVIDIA Geforce cuda). In windows 8 when i use the intel graphics card (stamina mode), i don't have any problem when i swift between metro UI and desktop UI. But, using the NVIDIA (speed mode), returning from metro UI to desktop UI, i have problem with "refreshing" the desktop. I mean that as background remaind the metro background and only if i move the mouse to the horizontal top windows appears the real wallpaper for dekstop (or if i hit the F5 function key!).
Is this a problem with NVIDIA driver (it comes from SONY), or probably a parameter in windows (i.e. in registry)?