objects visibility problem

[yan_birov]

1. After certain update of my model (4-5 bodies and 2 of them is modified stl, that I converted, not very complicated), all objects and viewcube dissapeared. I tried restarting fusion and my computer, enabled visibility of both (all objects and cube) but nothing seem to work. I still can open previous version of that project where everything is working. Is there any way to fix that new version? If no, then is there any way to downgrade so i can use modify and save previous version?