Hi I am having huge problem with my 3D. I have downloaded and opened the product but all four panels are see through I can not work on it. I can not draw anything. It is very annoying. There is no grid, no background on the four panels that I have to draw. What could be thr problem. COULD SOMEBODY HELP ME. IT HAS BEEN ONE WEEK I CONTACTED AUTODESK AND THEY JUST THROW ME FROM THIS DEPARTMENT TO THE OTHER. EVERY E-MAIL THEY SENT ME ARE THE SAME. NO HELP AT ALL!!!!!!!