Somehow zooming in or out made my 3d model just disappear off my screen and I cannot recentre or replace, zoom in or out or anything. Nothing on my display. No print bed, no model. I have turned off the program, restarted it and it always returns to the same thing. Nothing. I have uninstalled, reinstalled, changed 'printers' in the settings, chosen different files, everything I can think of but no display. I have updated my graphics drivers, I am still at a loss.