Hoping you can help! I upgraded from Pro 2015 to Pro 2016 and imported a plan i have been working on. Now i am unable to use the camera for any views, not elevations nor 3D, all i get is a brown/gray screen. I need to do a presentation and now all of the work I have done is inaccessible, since I can't even open it back in the 2015 software now that it has been converted! Help!!