I was drawing some geometry when suddenly the screen turned gray. I tried zooming in and out but nothing happened. Even tried undoing the last steps. I also switched between my scenes and for some reason some are green and some are gray. Zoom extents doesn´t appear to be doing anything. Any idea what could be the solution?
I am attaching the model: https://www.dropbox.com/s/2j3vrwcpxj1rvz8/190108-CC-.skp?dl=0