Whenever I import a step or iges model from a vender's website, It always starts out with a black screen. If I start to move the mouse around to orbit, the part pops up in the view. When I go to use the mouse wheel to zoom in or out, the part stays where it is except for a few "outlines" of the parts edges, and it only refreshes if I use the mouse to orbit again. It does this for multiple different models that I have tried to import, so I believe it's not the model that is bad. Does anyone have an idea whats going on here? I'ts really frustrating to not be able to import a model. I've tried running the import diagnostics and feature recognitions with the same results.