So all objects just seem to disappear or are extremely zoomed out. I can’t even see the origin now. It probably has something to do with “Tagging”. I did search for solutions and found out that you should only be working with faces in the “untagged layer” but I draw faces of different objects on different layers. Has anybody encountered the same problem and succeeded in bringing back the objects?
Did you use the zoom extents tool? If not Shift+Z is the shortcut. If you want, I can check your file and fix it for you.
This sort of problem happens fairly often, most of the time because something is very far from the model origin or misuse of tags has led to confusing visibility. Share the model and I’m sure someone here can straighten it out for you.