Hello. I have a laptop running windows 7 which does have an NVIDIA card, but I can not see thumbnails of my materials. I went to the NVIDIA control panel, Manage 3D settings, went to Program Settings and tried to add XPression.exe. I selected High performance NVIDIA processor (it defaulted to integrated graphics). I hit apply, but am still unable to see my materials, and if I go back into the 3D settings, XPression is not there. Any suggestions? Thanks in advance for your help.