Three of the most important things you should do is: Clear your cache of everything then turn off your computer and get some coffee (most important of the three), come back start it up again.  Then try it.  It might be that 512KByte section of your RAM  that Win everything uses for housekeeping, routing, and deciding what does what and when etc.  It needs to be zeroed out, sometimes on an hourly basis or you start getting other weird stuff happening too eg  rendering along singing a song and suddenly you are looking at your nice wallpaper screen with everything closed.  Might just work for you.  Plutom