I've created a simple 3d model DC15... launch viewer... and the screens blank. ?? I opened up some past models, and all is fine. I even go to plan view, etc... all blank screen. Thoughts?
Try hitting the home key.
You can also right-click in the O2C window and make sure that Scroll Bars is unchecked. You should see buttons in the lower right hand corner of the screen. Hit the "a" button (extents).