WDDM driver causes blank screen on login

[CrazyCasta]

After upgrading to VirtualBox 4.1.0 and upgrading guest box additions, using the WDDM driver (answering no to the 3D question), Windows gives me a blank screen after logging in. I am using Windows 7 x86. I was previously using VirtualBox 4.0.12 (as well as other previous versions) and associated guest addition 3D drivers (previous versions being installed in safe mode of course).

I can get past the problem by saving the state and then restarting the VM. In this case, I get a crash message from Desktop Window Manager and the graphics are rather strange. I'm not sure if the strangeness of the graphics is related to the WDDM driver or the fact that I saved the state and then restored it.